OFFSET
0,5
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
FORMULA
a(n) = A297325(n,n).
MAPLE
f:= proc(n) local k;
coeff(series(mul(1/(1+k*x^k)^n, k=1..n), x, n+1), x, n);
end proc:
map(f, [$0..30]); # Robert Israel, Dec 28 2017
MATHEMATICA
Table[SeriesCoefficient[Product[1/(1 + k x^k)^n, {k, 1, n}], {x, 0, n}], {n, 0, 27}]
CROSSREFS
KEYWORD
sign
AUTHOR
Ilya Gutkovskiy, Dec 28 2017
STATUS
approved