A266519 E.g.f.: Log( Sum_{n>=0} n^(2*n) * x^n/n! ).

1, 15, 683, 62038, 9342629, 2100483216, 658746323647, 274730459045232, 147034646085347145, 98233150285382861440, 80135799180812308488851, 78391682820973752124219392, 90580896598669336052642926957, 122061249780317702369474934804480, 189729092979696204185243101261174695, 336959230406443195042628708778757175296, 678101445794980815528276151098815880395921

Offset: 1

Author

Paul D. Hanna, Dec 31 2015

Keywords

• nonn

Crossrefs

Cf. A266520.

Programs

PARI

{a(n) = n! * polcoeff( log( sum(m=0,n, m^(2*m) * x^m/m!) +x*O(x^n)), n)}
for(n=1,20,print1(a(n),", "))