OFFSET
1,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (9,-36,84,-126,126,-84,36,-9,1)
FORMULA
a(n) = binomial(n^2,4) = (1/24)*n^2*(n^2-1)*(n^2-2)*(n^2-3).
G.f.: x^2*(1+x)*(1+116*x+606*x^2+116*x^3+x^4)/(1-x)^9. - Colin Barker, Jan 19 2012
MAPLE
a:= proc(n) binomial(n^2, 4) end: seq(a(n), n=1..35);
PROG
(Maxima)
makelist(binomial(n^2, 4), n, 1, 56); /* Martin Ettl, Oct 15 2012 */
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Martin Renner, Apr 20 2011
STATUS
approved