2100483216domain: NAppears in sequencesE.g.f.: Log( Sum_{n>=0} n^(2*n) * x^n/n! ).at n=5A266519E.g.f.: Log( Sum_{n>=0} (n + y)^(2*n) * x^n/n! ) = Sum_{n>=1} Sum_{k=0..n+1} T(n,k) * x^n*y^k/n!, as a triangle of coefficients T(n,k) read by rows.at n=25A266521