4016613

Appears in sequences

• Number of rooted n-edge one-vertex one-face maps on a non-orientable surface (of genus n).at n=6A118450
• Triangle read by rows: T(n,k) = number of rooted maps with n edges on a nonorientable surface of genus k (1 <= k <= n).at n=27A267180
• a(n) = number of maximal chord diagrams by genus d^(||)_2n.at n=7A347951