331233

Appears in sequences

• Row sums of Riordan array (c(-x^2),xc(-x^2)^2)^(-1) where c(x) is the g.f. of A000108.at n=16A138164
• Number of dispersed Dyck paths of length n (i.e., Motzkin paths of length n with no (1,0) steps at positive heights) having only ascents of even length (an ascent is a maximal sequence of consecutive (1,1)-steps).at n=32A191321
• Number of intersection points formed by drawing the line segments connecting any two lattice points of an n X m convex lattice polygon written as triangle T(n,m), n >= 1, 1 <= m <= n.at n=43A288180
• a(n) = Sum_{k=0..n} (4*k+1) * binomial(3*n+k+1,n-k)/(3*n+k+1).at n=8A390519