A028094 Expansion of 1/((1-3x)(1-7x)(1-9x)(1-11x)).

1, 30, 580, 9210, 130921, 1735860, 21961360, 268816620, 3212241241, 37702583490, 436534074340, 5001585910230, 56839066698961, 641793883438920, 7209996952371520, 80670652808858040, 899681515488592081

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Index entries for linear recurrences with constant coefficients, signature (30, -320, 1410, -2079).

Formula

a(n)=(3*11^(n+3)-8*9^(n+3)+6*7^(n+3)-3^(n+3))/192. [Yahia Kahloune, Jun 10 2013]

Mathematica

CoefficientList[Series[1/((1-3x)(1-7x)(1-9x)(1-11x)), {x, 0, 30}], x] (* or *) LinearRecurrence[{30, -320, 1410, -2079}, {1, 30, 580, 9210}, 30] (* Harvey P. Dale, Dec 15 2014 *)

Crossrefs

Sequence in context: A028099 A028140 A028169 * A028138 A028127 A028086

Adjacent sequences: A028091 A028092 A028093 * A028095 A028096 A028097

Keyword

nonn,easy

Author

N. J. A. Sloane.

Status

approved