A301800 - OEIS

A301800

Expansion of Product_{k>=1} (1 + x^k)^A000593(k).

1, 1, 1, 5, 5, 11, 21, 29, 53, 86, 139, 211, 346, 524, 806, 1264, 1866, 2838, 4253, 6306, 9304, 13751, 20018, 29142, 42365, 60900, 87569, 125326, 178535, 253371, 358974, 505673, 710871, 996658, 1391551, 1938801, 2693543, 3730901, 5154610, 7106235, 9767649

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OFFSET

0,4

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 0..1000

FORMULA

a(n) ~ exp(3 * Pi^(2/3) * Zeta(3)^(1/3) * n^(2/3)/4) * Zeta(3)^(1/6) / (2^(25/24) * sqrt(3) * Pi^(1/6) * n^(2/3)).

MATHEMATICA

nmax = 40; CoefficientList[Series[Exp[Sum[-(-1)^j * Sum[DivisorSum[k, -(-1)^# k / # &] * x^(j*k) / j, {k, 1, Floor[nmax/j] + 1}], {j, 1, nmax}]], {x, 0, nmax}], x] (* Vaclav Kotesovec, Mar 31 2018 *)

CROSSREFS

Cf. A000593, A002131, A301798, A301799.

Sequence in context: A121849 A164930 A298165 * A214827 A298955 A299591

Adjacent sequences: A301797 A301798 A301799 * A301801 A301802 A301803

KEYWORD

nonn

AUTHOR

Vaclav Kotesovec, Mar 26 2018

STATUS

approved