648792

Appears in sequences

• Number of rooted toroidal maps with 4 faces and n vertices and without separating cycles or isthmuses.at n=4A006424
• Numbers k such that 201*2^k+1 is prime.at n=23A032477
• Triangle read by rows: T(n,k) is the number of rooted toroidal maps with n edges and k faces and without separating cycles or isthmuses, n >= 2, k = 1..n-1.at n=31A343090
• Triangle read by rows: T(n,k) is the number of rooted toroidal maps with n edges and k faces and without separating cycles or isthmuses, n >= 2, k = 1..n-1.at n=32A343090