A039912 - OEIS

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A039912

Triangle related to number of compositions of n into relatively prime summands.

5

1, 1, -2, 1, -3, 4, 1, -4, 6, -8, 1, -5, 10, -9, 16, 1, -6, 15, -20, 9, -32, 1, -7, 21, -35, 36, 0, 64, 1, -8, 28, -56, 70, -64, -27, -128, 1, -9, 36, -84, 126, -125, 120, 81, 256, 1, -10, 45, -120, 210, -252, 200, -240, -162, -512, 1, -11, 55, -165, 330, -462, 463, -275, 496, 243, 1024, 1, -12, 66, -220, 495, -792, 924

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

2,3

LINKS

Table of n, a(n) for n=2..74.

H. W. Gould, Binomial coefficients, the bracket function and compositions with relatively prime summands, Fib. Quart. 2 (1964), 2.

EXAMPLE

Triangle begins:

1;

1, -2;

1, -3, 4;

1, -4, 6, -8;

1, -5, 10, -9, 16;

1, -6, 15, -20, 9, -32;

1, -7, 21, -35, 36, 0, 64;

...

CROSSREFS

Sequence in context: A085643 A174829 A132110 * A163311 A210555 A008949

Adjacent sequences: A039909 A039910 A039911 * A039913 A039914 A039915

KEYWORD

tabl,sign

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vladeta Jovovic, Feb 26 2008

STATUS

approved