422928

Appears in sequences

• Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k UDL's (n >= 0; 0 <= k <= floor((n+1)/2)).at n=42A128728
• G.f. 1-(2*x^3)/(-sqrt(-3*x^4-4*x^3-2*x^2+1)-x^2+1).at n=25A247162
• Expansion of Product_{k>=1} (1 + k!*x^k).at n=9A265950