OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (5,-9,5,5,-9,5,-1).
FORMULA
From R. J. Mathar, Mar 24 2011: (Start)
a(n) = (2*n+3)*(6*n^4+36*n^3+76*n^2+66*n+5)/960-(-1)^n/64.
G.f.: x*(1+x+x^2) / ( (1+x)*(x-1)^6 ). (End)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved