126008

Appears in sequences

• Base 5 digits are, in order, the first n terms of the periodic sequence with initial period 1,3,0.at n=7A037598
• a(n) = A004017(n)/2.at n=24A045825
• Sum of the path lengths of all binary trees with n edges.at n=8A138156
• Number of valleys at level 0 in all dispersed Dyck paths of length n (i.e., in all Motzkin paths of length n with no (1,0) steps at positive heights).at n=19A191389
• Numbers k that divide the base-5 reversal of k.at n=21A222816
• G.f. satisfies: A(x,y) = 1 + x*y*A(x,y+1)^2.at n=53A268652
• G.f. A(x,y) satisfies: A( x - y*A(x,y)^2, y) = x + (1-y)*A(x,y)^2, where the coefficients T(n,k) of x^n*y^k form a triangle read by rows n>=1, for k=0..n-1.at n=46A277295