|
|
A021794
|
|
Expansion of 1/((1-x)(1-4x)(1-5x)(1-12x)).
|
|
1
|
|
|
1, 22, 335, 4460, 56061, 686802, 8317435, 100210120, 1204613321, 14466168782, 173649468135, 2084076423780, 25010353485781, 300131513309962, 3601614875036435, 43219563508677440, 518635692871953441
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
FORMULA
|
G.f.: 1/((1-x)*(1-4*x)*(1-5*x)*(1-12*x)).
a(n) = -1/132 +2^(2n+3)/3 -5^(n+3)/28 +2^(2n+3)*3^(n+3)/77. - Bruno Berselli, May 08 2013
a(n) = 22*a(n-1) - 149*a(n-2) + 368*a(n-3) - 240*a(n-4). - Wesley Ivan Hurt, Apr 12 2023
|
|
MATHEMATICA
|
CoefficientList[Series[1/((1-x) (1-4 x) (1-5 x) (1-12 x)), {x, 0, 20}], x] (* Bruno Berselli, May 08 2013 *)
|
|
PROG
|
(PARI) Vec(1/((1-x)*(1-4*x)*(1-5*x)*(1-12*x))+O(x^20)) \\ Bruno Berselli, May 08 2013
(Magma) m:=20; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!(1/((1-x)*(1-4*x)*(1-5*x)*(1-12*x)))); // Bruno Berselli, May 08 2013
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|