40485

Appears in sequences

• a(n) = n*(3*n^2 - 1)/2.at n=30A004188
• Antidiagonal sums of A086272 (and of A086273).at n=29A086274
• Number of simple graphs on n labeled nodes, where each maximally connected subgraph is either a tree or a cycle, also row sums of A144163, A215861.at n=7A144164
• Numbers k such that (18^k + 1)^2 - 2 is prime.at n=6A364079
• Expansion of e.g.f. (1/x) * Series_Reversion( x * sqrt(1 - 2*x*exp(x)) ).at n=5A380077