OFFSET
0,6
LINKS
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 725
Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1).
FORMULA
a(n)=0, n <= 4; a(n) = n*(n-1)*(n-2)*(n-3), n >= 5.
G.f.: 24*x^5*(5-10*x+10*x^2-5*x^3+x^4)/(1-x)^5. [Colin Barker, Jun 25 2012]
MAPLE
spec := [S, {B=Set(Z, 1 <= card), S=Prod(Z, Z, Z, Z, B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
encyclopedia(AT)pommard.inria.fr, Jan 25 2000
EXTENSIONS
More terms and corrected formula from Larry Reeves (larryr(AT)acm.org), Jan 23 2001
STATUS
approved