264664

Appears in sequences

• G.f.: 1/(1 + x - x^2 - x^3 + x^4).at n=48A199803
• Trisection 0 of A199803.at n=16A199930
• Number of simple labeled graphs on n nodes with exactly 1 connected component that is a tree or a cycle.at n=7A215851
• Number T(n,k) of simple labeled graphs on n nodes with exactly k connected components that are trees or cycles; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=37A215861