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A349874
Expansion of A(x)^3, where A(x) is g.f. of n^n (A000312).
1
1, 3, 15, 106, 990, 11688, 168529, 2886039, 57372984, 1299676869, 33049616319, 931991169660, 28856822050546, 972979199567826, 35480222492288493, 1391109691131953417, 58351612093156552572, 2607190821521732751855, 123613763047459102476027
OFFSET
0,2
FORMULA
a(n) ~ 3 * n^n.
MATHEMATICA
nmax = 20; CoefficientList[Series[(1 + Sum[n^n * x^n, {n, 1, nmax}])^3, {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Dec 03 2021
STATUS
approved