225648

Appears in sequences

• a(n) = T(n,n-1), array T as in A050143. Also T(2n+1,n), array T as in A055807.at n=8A050147
• Triangle G(n,k) read by rows: number of order-preserving partial transformations (of an n-element totally ordered set) of waist k (waist(alpha) = max(Im(alpha))).at n=53A111516