37826domain: NAppears in sequencesRow sums of triangle A054453.at n=15A054455G.f.: 1 + Sum_{n>=1} a(n)*x^n/(1 - x^n) = Product_{n>=1} (1 + n*x^n).at n=22A300278Number of unlabeled loop-graphs covering n vertices such that it is possible to choose a different vertex from each edge (choosable).at n=12A369200