122464

Appears in sequences

• Expansion of 1/((1+x)*(1-x)^11).at n=10A001786
• Number of nodes of even outdegree (including leaves) in all ordered trees with n edges.at n=10A026641
• a(n) = A026637(n, floor(n/2)).at n=19A026643
• Numerators of continued fraction convergents to sqrt(813).at n=6A042568
• Number of symmetric Dyck paths of semilength n and having no hills (i.e., no peaks at level 1).at n=20A109078
• A tree-node counting triangle.at n=55A109244
• a(n) = (1/2)*(1 + 3*i)^n + (1/2)*(1 - 3*i)^n where i = sqrt(-1).at n=10A120743
• 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=20A191526
• Number of 5 X n 0..1 arrays with rows unimodal and columns nondecreasing.at n=9A225012
• Number of length n arrays of permutations of 0..n-1 with each element moved by -n to n places and every three consecutive elements having its maximum within 4 of its minimum.at n=15A263696