467842

Appears in sequences

• Expansion of 1/((1+x)*(1-x)^12).at n=11A001808
• Number of nodes of even outdegree (including leaves) in all ordered trees with n edges.at n=11A026641
• a(n) = A026637(n, floor(n/2)).at n=21A026643
• Number of symmetric Dyck paths of semilength n and having no hills (i.e., no peaks at level 1).at n=22A109078
• Number left factors of Dyck paths of length n and having no hills; a hill is a (1,1)-step starting at level 0 and followed by a (1,-1)-step.at n=22A191526
• Number of n X 3 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value increasing by 0 or 1 with every step right, diagonally se or down.at n=16A253006