OFFSET
1,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..450
FORMULA
MAPLE
with(combinat):
b:= proc(n, i) option remember; `if`(n=0, [1, 0], `if`(i<1, 0,
add(multinomial(n, n-i*j, i$j)/j!*(i-1)!^j*(p-> p+
[0, p[1]*`if`(j>0, 1, 0)])(b(n-i*j, i-1)), j=0..n/i)))
end:
a:= n-> b(n$2)[2]:
seq(a(n), n=1..30); # Alois P. Heinz, Oct 21 2015
MATHEMATICA
Rest[ Range[0, 21]! CoefficientList[ Series[1/(1 - x) Sum[1 - Exp[ -x^k/k], {k, 25}], {x, 0, 21}], x]] - Robert G. Wilson v, Sep 13 2007
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladeta Jovovic, Sep 06 2007
EXTENSIONS
More terms from Robert G. Wilson v, Sep 13 2007
STATUS
approved