The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A190252 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A190252

Riordan matrix (g(x),x*g(x)), where g(x) = (1-x-sqrt(1-2*x-3*x^2-4*x^3))/(2*x^2*(1+x)).
(history; published version)

#20 by Alois P. Heinz at Tue Jun 06 18:11:03 EDT 2023

STATUS

editing

approved

#19 by Alois P. Heinz at Tue Jun 06 18:11:00 EDT 2023

EXAMPLE

...

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approved

editing

#18 by Alois P. Heinz at Tue Jun 06 18:10:43 EDT 2023

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proposed

approved

#17 by Michael De Vlieger at Tue Jun 06 16:58:00 EDT 2023

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editing

proposed

#16 by Michael De Vlieger at Tue Jun 06 16:57:59 EDT 2023

LINKS

Paul Barry, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL26/Barry/barry601.html">On Motzkin-Schröder Paths, Riordan Arrays, and Somos-4 Sequences</a>, J. Int. Seq. (2023) Vol. 26, Art. 23.4.7.

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approved

editing

#15 by Joerg Arndt at Sat Oct 30 07:17:07 EDT 2021

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proposed

approved

#14 by Michel Marcus at Sat Oct 30 03:35:10 EDT 2021

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editing

proposed

#13 by Michel Marcus at Sat Oct 30 03:35:06 EDT 2021

COMMENTS

Triangle begins:

1;

1, 1;

2, 2, 1;

5, 5, 3, 1;

12, 14, 9, 4, 1;

31, 38, 28, 14, 5, 1;

83, 106, 84, 48, 20, 6, 1;

227, 301, 252, 157, 75, 27, 7, 1;

634, 864, 758, 504, 265, 110, 35, 8, 1;

EXAMPLE

Triangle begins:

1;

1, 1;

2, 2, 1;

5, 5, 3, 1;

12, 14, 9, 4, 1;

31, 38, 28, 14, 5, 1;

83, 106, 84, 48, 20, 6, 1;

227, 301, 252, 157, 75, 27, 7, 1;

634, 864, 758, 504, 265, 110, 35, 8, 1;

STATUS

approved

editing

#12 by N. J. A. Sloane at Wed Dec 27 01:39:04 EST 2017

STATUS

proposed

approved

#11 by Jon E. Schoenfield at Tue Dec 26 23:51:00 EST 2017

STATUS

editing

proposed