31685

Appears in sequences

• a(n) = 4*prime(n)^2+1.at n=23A060429
• Number of non-intersecting cycle systems in a particular directed graph.at n=11A114300
• Number of labeled directed multigraphs with n arcs and with no vertex of indegree 0.at n=6A122420
• G.f.: Sum_{n>=0} n! * x^n * Product_{k=1..n} (1 + k*x) / (1 + k*x + k^2*x^2).at n=9A208237
• Number of maximal matchings in the n-Cameron graph.at n=3A387588