105680

Appears in sequences

• Number of binary trees of path length n.at n=39A095830
• Coordination sequence for D_20 lattice.at n=2A107515
• Number of 2 X 2 matrices with all elements in {0,1,...,n} and nonnegative even determinant.at n=23A210371
• Number of n X 4 arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 n X 4 array.at n=16A219350
• a(n) = (n + 1)*(20*n^2 + 19*n + 6)/6.at n=31A220084