OFFSET
1,2
FORMULA
a(n) = Sum_{i=1..n} A000140(i).
a(n) ~ 6 * n^(n-1) / exp(n). - Vaclav Kotesovec, Oct 27 2016
MATHEMATICA
f[n_] := Max@ CoefficientList[ Expand@ Product[ Sum[x^i, {i, 0, j}], {j, n - 1}], x]; Accumulate@ Array[f, 21]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Feb 19 2010
EXTENSIONS
a(15) corrected by Georg Fischer, Aug 28 2020
STATUS
approved