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 A021854 Expansion of 1/((1-x)(1-4x)(1-7x)(1-8x)). 1

%I

%S 1,20,265,2940,29601,280740,2558905,22683980,197048401,1685772660,

%T 14253277545,119401486620,992861126401,8206523123780,67497981692185,

%U 552905862106860,4513706683463601,36742894880462100

%N Expansion of 1/((1-x)(1-4x)(1-7x)(1-8x)).

%H Vincenzo Librandi, <a href="/A021854/b021854.txt">Table of n, a(n) for n = 0..200</a>

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (20,-135,340,-224).

%F a(n) = (9*8^(n+3) - 14*7^(n+3) + 7*4^(n+3) - 2)/252. - _Yahia Kahloune_, Jul 05 2013

%t CoefficientList[Series[1 / ((1 - x) (1 - 4 x) (1 - 7 x) (1 - 8 x)), {x, 0, 20}], x] (* _Vincenzo Librandi_, Jul 11 2013 *)

%K nonn,easy

%O 0,2

%A _N. J. A. Sloane_.

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Last modified December 4 13:03 EST 2021. Contains 349526 sequences. (Running on oeis4.)