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A294372
Expansion of (1-x)^4/(x^2 + 4*x + 1).
3
1, -8, 37, -144, 540, -2016, 7524, -28080, 104796, -391104, 1459620, -5447376, 20329884, -75872160, 283158756, -1056762864, 3943892700, -14718807936, 54931339044, -205006548240, 765094853916, -2855372867424, 10656396615780, -39770213595696, 148424457767004
OFFSET
0,2
FORMULA
G.f.: 1/Sum_{k>=0} (k+1)^3*x^k.
From Colin Barker, Dec 19 2017: (Start)
a(n) = -6*sqrt(3)*((-2-sqrt(3))^n*(-2+sqrt(3)) + (-2+sqrt(3))^n*(2+sqrt(3))) for n > 2.
a(n) = -4*a(n-1) - a(n-2) for n > 4.
(End)
PROG
(PARI) N=66; x='x+O('x^N); Vec((1-x)^4/(x^2+4*x+1))
CROSSREFS
Sequence in context: A055799 A035038 A240188 * A256412 A272731 A272806
KEYWORD
sign,easy
AUTHOR
Seiichi Manyama, Dec 19 2017
STATUS
approved