4608000domain: NAppears in sequencesGeneralized Stirling2 array S_{5,5}(n,k).at n=10A090216G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..2*n} A200536(n,2*n-k)^2 * x^k] / A(x)^n * x^n/n ), where A200536(n,2*n-k) is the coefficient of x^k in (2+3*x+x^2)^n.at n=29A251689Number of positive divisors of hyperfactorial(n).at n=12A260146