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A028175
Expansion of 1/((1-5x)(1-6x)(1-9x)(1-11x)).
1
1, 31, 612, 9842, 140903, 1874733, 23747074, 290631904, 3469802325, 40674188555, 470287309856, 5380934171886, 61072079752867, 688801372689097, 7730331225654558, 86417957138887388, 963072515157938129
OFFSET
0,2
FORMULA
a(n)=(2*11^(n+3)-5*9^(n+3)+8*6^(n+3)-5^(n+4))/120. [Yahia Kahloune, Jun 03 2013]
MATHEMATICA
CoefficientList[Series[1/((1-5x)(1-6x)(1-9x)(1-11x)), {x, 0, 30}], x] (* or *) LinearRecurrence[{31, -349, 1689, -2970}, {1, 31, 612, 9842}, 30] (* Harvey P. Dale, Nov 18 2014 *)
PROG
(PARI) x='x+O('x^66); Vec(1/((1-5*x)*(1-6*x)*(1-9*x)*(1-11*x))) \\ Joerg Arndt, Jun 03 2013
CROSSREFS
Sequence in context: A215794 A028182 A028155 * A028150 A028173 A301769
KEYWORD
nonn
AUTHOR
STATUS
approved