261648

Appears in sequences

• Triangle read by rows: T(n,k) is the number of c-nets with n-k inner vertices and k outer vertices, 3 <= n, 2 <= k <= n-1.at n=62A285165
• Column 9 of A285165.at n=3A285172
• Expansion of e.g.f. arcsinh(x*exp(x)).at n=9A297010