245776domain: NAppears in sequencesa(n) = n + (n-1)*2^(n-2).at n=15A188626G.f.: exp( Integral Sum_{n>=1} n!*n^(n-1)*x^(n-1) / Product_{k=1..n} (1+k*n*x) dx ).at n=6A243807Number of cycles in the n-dipyramidal graph.at n=29A307621