241220

Appears in sequences

• Number of loopless tree-rooted planar maps with 4 vertices and n faces.at n=7A006429
• Triangle read by rows: T(n,k) is the number of tree-rooted loopless planar maps with n edges, k faces and no isthmuses, n >= 0, k = 1..n+1.at n=58A342985
• Triangle read by rows: T(n,k) is the number of tree-rooted loopless planar maps with n edges, k faces and no isthmuses, n >= 0, k = 1..n+1.at n=62A342985