OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
B. A. Huberman and T. Hogg, Complexity and adaptation, Evolution, games and learning (Los Alamos, N.M., 1985). Phys. D 22 (1986), no. 1-3, 376-384.
Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).
FORMULA
G.f.: -(4*x^4+21*x^3+27*x^2+8*x+1)*x / (x-1)^7.
a(n) = (61*n^6+69*n^5+145*n^4+195*n^3+154*n^2+96*n)/6!.
MAPLE
a:= n-> (((((61*n+69)*n+145)*n+195)*n+154)*n+96)*n/6!:
seq(a(n), n=0..40);
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Jul 28 2017
STATUS
approved