50784

Appears in sequences

• Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,2 3,3 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155275
• a(n) = 2*n*A071148(n).at n=23A177082
• Expansion of phi(x)^2 / phi(-x^2) in powers of x where phi() is a Ramanujan theta function.at n=38A260314
• Number T(n,k) of binary search trees of height k having n internal nodes; triangle T(n,k), n>=0, max(0,floor(log_2(n))+1)<=k<=n, read by rows.at n=49A335919