204225domain: NAppears in sequencesTriangular array T(n,k) (n>=1, 0<=k<=n(n-1)/2) giving the total number of connected components in all subgraphs obtained from the complete labeled graph K_n by removing k edges.at n=49A125206Expansion of e.g.f. (1/x) * Series_Reversion( x/(x + exp(x^2/2)) ).at n=7A370877