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A021904 Expansion of 1/((1-x)(1-4x)(1-8x)(1-9x)). 1
1, 22, 323, 3992, 44949, 478074, 4896391, 48839164, 477813017, 4606751006, 43913627979, 414851195616, 3890711480605, 36272898564418, 336508406905487, 3108995652410948, 28624326520414113, 262765886779943910 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

a(n) = (21*9^(n+3) - 30*8^(n+3) + 14*4^(n+3) - 5)/840. [Yahia Kahloune, Jul 03 2013]

MATHEMATICA

CoefficientList[Series[1 / ((1 - x) (1 - 4 x) (1 - 8 x) (1 - 9 x)), {x, 0, 20}], x] (* Vincenzo Librandi, Jul 11 2013 *)

CROSSREFS

Sequence in context: A022453 A025968 A025948 * A022343 A025945 A288576

Adjacent sequences:  A021901 A021902 A021903 * A021905 A021906 A021907

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 14 06:49 EST 2018. Contains 317162 sequences. (Running on oeis4.)