A299035 a(n) = [x^n] Product_{k=1..n} 1/(1-k^k*x).

1, 1, 21, 23980, 4896624249, 327969374429859111, 11123496833223144303532943536, 273486179312859032380857823231575174373792, 6620886635410516590847876477644821623913997428738363459941

Offset

0,3

Links

Seiichi Manyama, Table of n, a(n) for n = 0..26

Formula

a(n) ~ n^(n^2). - Vaclav Kotesovec, Feb 02 2018

Mathematica

Table[SeriesCoefficient[Product[1/(1 - k^k*x), {k, 1, n}], {x, 0, n}], {n, 0, 10}] (* Vaclav Kotesovec, Feb 02 2018 *)

Crossrefs

Cf. A002109.

Cf. A007820, A298851, A299036.

Sequence in context: A172724 A001167 A250066 * A189648 A351804 A283841

Adjacent sequences: A299032 A299033 A299034 * A299036 A299037 A299038

Keyword

nonn

Author

Seiichi Manyama, Feb 01 2018

Status

approved