170317

Appears in sequences

• a(n) = binomial(n+2, 2) + binomial(n+4, 5).at n=27A027658
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (-1, 1, 1), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.at n=9A149795
• Triangle read by rows: T(n,k) is the number of digraphs on n unlabeled unisolated nodes with k arcs, k = 0..n*(n-1).at n=58A350908