372060

Appears in sequences

• Number of atoms in first n shells of type I hyperfullerene.at n=26A063497
• Number of simple directed graphs on n labeled nodes consisting only of some cycle graphs C_2 and nodes not part of a cycle having directed edges to both nodes in exactly one cycle.at n=10A133189
• Triangle T(n,k) = number of forests of labeled rooted trees of height at most 1, with n labels, where each root contains k labels, n>=0, 0<=k<=n.at n=57A143398
• E.g.f.: exp(1/2! * x^2 * exp(-x)).at n=10A292909