173776

Appears in sequences

• Number of rooted toroidal maps with 3 faces and n vertices and without separating cycles or isthmuses.at n=5A006423
• Concatenation of first 3 digits and last 3 digits of n-th even superperfect number A061652(n).at n=21A138872
• 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=30A343090
• 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=33A343090