OFFSET
0,3
LINKS
Robert Israel, Table of n, a(n) for n = 0..1000
FORMULA
a(n) = A297321(n,n).
a(n) ~ c * d^n / sqrt(n), where d = 5.814548482877687529318372516965305077397562... and c = 0.2563102401728134539247148322678842806264... - Vaclav Kotesovec, Aug 01 2019
MAPLE
f:= proc(n) local k;
coeff(series(mul((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 + k x^k)^n, {k, 1, n}], {x, 0, n}], {n, 0, 24}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Dec 28 2017
STATUS
approved