A025937 Expansion of 1/((1-2x)(1-3x)(1-6x)(1-7x)).

1, 18, 211, 2052, 18025, 148806, 1179487, 9089784, 68647909, 510709914, 3756191803, 27381204396, 198197187553, 1426557620142, 10220981500759, 72957382445088, 519164877763357, 3684933735388290, 26099214855723955

Offset

0,2

Links

Table of n, a(n) for n=0..18.

Index entries for linear recurrences with constant coefficients, signature (18,-113,288,-252).

Formula

a(n) = -3*6^(n+1) -2^(n+1)/5 +7^(n+3)/20 + 3^(n+2)/4. - R. J. Mathar, May 22 2013

Crossrefs

Sequence in context: A229270 A261484 A004323 * A021804 A025932 A260569

Adjacent sequences: A025934 A025935 A025936 * A025938 A025939 A025940

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved