A026391 Expansion of 1/((1-2x)(1-6x)(1-7x)(1-10x)).

1, 25, 407, 5489, 66759, 762321, 8356279, 89114113, 932519687, 9629963057, 98523692631, 1001349555297, 10129549127335, 102127457330833, 1027215881948663, 10314453257429441, 103444825304722503

Offset

0,2

Links

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

Index entries for linear recurrences with constant coefficients, signature (25,-218,764,-840).

Formula

a(n) = -2^n/20 +27*6^n/2 -343*7^n/15 +125*10^n/12. - R. J. Mathar, Jun 23 2013

Mathematica

CoefficientList[Series[1/((1-2x)(1-6x)(1-7x)(1-10x)), {x, 0, 20}], x] (* Harvey P. Dale, Jan 17 2019 *)

Crossrefs

Sequence in context: A028061 A026561 A048908 * A028044 A028057 A260953

Adjacent sequences: A026388 A026389 A026390 * A026392 A026393 A026394

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved