109075

Appears in sequences

• Number of rooted toroidal maps with 4 faces and n vertices and without separating cycles or isthmuses.at n=3A006424
• 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=24A343090