This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A266519 #6 Dec 31 2015 15:06:24
%S A266519 1,15,683,62038,9342629,2100483216,658746323647,274730459045232,
%T A266519 147034646085347145,98233150285382861440,80135799180812308488851,
%U A266519 78391682820973752124219392,90580896598669336052642926957,122061249780317702369474934804480,189729092979696204185243101261174695,336959230406443195042628708778757175296,678101445794980815528276151098815880395921
%N A266519 E.g.f.: Log( Sum_{n>=0} n^(2*n) * x^n/n! ).
%o A266519 (PARI) {a(n) = n! * polcoeff( log( sum(m=0,n, m^(2*m) * x^m/m!) +x*O(x^n)), n)}
%o A266519 for(n=1,20,print1(a(n),", "))
%Y A266519 Cf. A266520.
%K A266519 nonn
%O A266519 1,2
%A A266519 _Paul D. Hanna_, Dec 31 2015