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A220888
a(n) = F(n+7) - (1/2)*(n^3+2*n^2+13*n+26) where F(i) is a Fibonacci number (A000045).
0
0, 0, 0, 0, 2, 11, 37, 98, 225, 470, 919, 1713, 3082, 5400, 9274, 15688, 26236, 43499, 71655, 117466, 191875, 312590, 508265, 825265, 1338612, 2169696, 3514932, 5692128, 9215510, 14917115, 24143209, 39072098, 63228357, 102314870, 165559099, 267891393, 433469566, 701381784, 1134874030
OFFSET
0,5
FORMULA
G.f.: -x^4*(2+x) / ( (x^2+x-1)*(x-1)^4 ). - R. J. Mathar, Jan 11 2013
a(n) = A014166(n-4)+2*A014166(n-3). - R. J. Mathar, Mar 24 2013
MATHEMATICA
LinearRecurrence[{5, -9, 6, 1, -3, 1}, {0, 0, 0, 0, 2, 11}, 39] (* Jean-François Alcover, Feb 12 2019 *)
CROSSREFS
Sequence in context: A152819 A297406 A178138 * A289616 A038607 A079009
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 29 2012
STATUS
approved