OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..385
FORMULA
a(n) ~ exp(exp(-1)) * n^(n+1).
MAPLE
B:= proc(n) option remember; n^n end:
b:= proc(n, i) option remember; `if`(n=0, 1, `if`(i=1, B(n),
(h-> add(b(j, h)*b(n-j, i-h), j=0..n))(iquo(i, 2))))
end:
a:= n-> b(n$2):
seq(a(n), n=0..20); # Alois P. Heinz, Aug 23 2019
MATHEMATICA
Table[SeriesCoefficient[(1+Sum[k^k*x^k, {k, 1, n}])^n, {x, 0, n}], {n, 0, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Aug 11 2019
STATUS
approved