A025939 Expansion of 1/((1-2x)(1-3x)(1-6x)(1-9x)).

1, 20, 265, 2960, 30301, 295340, 2795905, 25996520, 238988101, 2181067460, 19810829545, 179385327680, 1620996705901, 14628147660380, 131888407103185, 1188406175868440, 10704118783463701, 96387848642218100

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Index entries for linear recurrences with constant coefficients, signature (20, -135, 360, -324).

Formula

a(n) = -6^(n+1)-2^(n+1)/7 +3^(n+1)/2 +9^(n+2)/14. - R. J. Mathar, Jun 04 2013

Crossrefs

Sequence in context: A278408 A229562 A021854 * A278773 A021824 A125455

Adjacent sequences: A025936 A025937 A025938 * A025940 A025941 A025942

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved