263284

Appears in sequences

• Number of rooted maps with n edges on Klein bottle.at n=4A006344
• Numbers k such that the sum of the nonsquare numbers from 1 to k is a square.at n=8A065992
• T(n,k) is the number of partial bijections (or subpermutations) of an n-element set of height k (height(alpha) = |Im(alpha)|) and without fixed points.at n=42A144089
• 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=16A267180