277972

Appears in sequences

• Number of self-avoiding planar walks of length n*(n+1)/2 starting at (0,0), ending at (n,0), remaining in the first quadrant and using steps (0,1), (1,0), (1,1), (-1,1), and (1,-1) with the restriction that (0,1) is never used below the diagonal and (1,0) is never used above the diagonal.at n=15A284418
• Expansion of e.g.f. 1/(1 - Sum_{k>=1} sigma_k(k) * x^k/k!).at n=6A352841