A028131 Expansion of 1/((1-4x)(1-6x)(1-7x)(1-9x)).

1, 26, 429, 5746, 68285, 751842, 7859293, 79189682, 776807229, 7469674498, 70755237917, 662574315858, 6150105857533, 56698559685794, 519954841569501, 4748676612377074, 43230125518942397, 392566127341918530

Offset

0,2

Links

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

Index entries for linear recurrences with constant coefficients, signature (26,-247,1014,-1512).

Formula

a(n) = (9^(n+3)-5*7^(n+3)+5*6^(n+3)-4^(n+3))/30. - Yahia Kahloune, Jun 02 2013

Mathematica

CoefficientList[Series[1/((1-4x)(1-6x)(1-7x)(1-9x)), {x, 0, 30}], x] (* Harvey P. Dale, Jan 20 2019 *)

Crossrefs

Sequence in context: A197087 A028165 A218896 * A028120 A028079 A028117

Adjacent sequences: A028128 A028129 A028130 * A028132 A028133 A028134

Keyword

nonn,easy

Author

N. J. A. Sloane.

Status

approved