The On-Line Encyclopedia of Integer Sequences (OEIS)

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A105537

Matrix square of triangle A105535 and, in this flattened form as read by rows, also equals diagonal 1 of A105535.
(history; published version)

#3 by Russ Cox at Fri Mar 30 18:36:45 EDT 2012

AUTHOR

_Paul D. Hanna (pauldhanna(AT)juno.com), _, Apr 12 2005

Discussion

Fri Mar 30

18:36

OEIS Server: https://oeis.org/edit/global/213

#2 by N. J. A. Sloane at Sat Nov 10 03:00:00 EST 2007

KEYWORD

nonn,tabl,new

AUTHOR

Paul D . Hanna (pauldhanna(AT)juno.com), Apr 12 2005

#1 by N. J. A. Sloane at Tue Jul 19 03:00:00 EDT 2005

NAME

Matrix square of triangle A105535 and, in this flattened form as read by rows, also equals diagonal 1 of A105535.

DATA

1, 2, 1, 4, 4, 1, 6, 8, 2, 1, 12, 26, 7, 12, 4, 21, 55, 15, 34, 12, 1, 32, 91, 25, 65, 22, 2, 1, 52, 178, 44, 237, 80, 10, 24, 9, 83, 329, 74, 593, 200, 27, 82, 32, 1, 127, 557, 117, 1178, 396, 55, 196, 76, 4, 1, 185, 866, 174, 1990, 670, 95, 361, 135, 8, 2, 1, 273, 1411, 261

OFFSET

0,2

COMMENTS

Diagonal n of triangular matrix A105535 equals A105535^(n+1) when flattened as read by rows.

EXAMPLE

Triangle begins:

1;

2,1;

4,4,1;

6,8,2,1;

12,26,7,12,4;

21,55,15,34,12,1;

32,91,25,65,22,2,1;

52,178,44,237,80,10,24,9;

83,329,74,593,200,27,82,32,1;

127,557,117,1178,396,55,196,76,4,1; ...

PROG

(PARI)

CROSSREFS

Cf. A105535, A105538 (row sums).

KEYWORD

nonn,tabl

AUTHOR

Paul D Hanna (pauldhanna(AT)juno.com), Apr 12 2005

STATUS

approved