OFFSET
0,3
LINKS
Eric Weisstein's World of Mathematics, Stirling Transform.
FORMULA
a(n) = Sum_{k=0..n} stirling2(n,k) * (k!)^4.
a(n) ~ n!^4.
MATHEMATICA
Table[Sum[StirlingS2[n, k]*k!^4, {k, 0, n}], {n, 0, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Jul 12 2018
STATUS
approved