OFFSET
1,2
LINKS
FORMULA
a(n) = m!^n Sum_{p=1..n*m} (Choose(p,m)^n/p!) Sum_{k=0..n*m-p} (-1)^k/k! with m=6.
MATHEMATICA
Table[(6!^n)*Sum[Binomial[p, 6]^n/p! * Sum[(-1)^k/k!, {k, 0, 6n-p}], {p, 1, 6n}], {n, 1, 10}] (* Indranil Ghosh, Mar 04 2017 *)
PROG
(PARI) a(n) = (6!^n)*sum(p=1, 6*n, binomial(p, 6)^n/p! * sum(k=0, 6*n-p, (-1)^k/k!)); \\ Indranil Ghosh, Mar 04 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Marko Riedel, Mar 01 2017
STATUS
approved