211546

Appears in sequences

• Number of paths from (0,0) to (3n,0) that stay in first quadrant (but may touch horizontal axis), where each step is (2,1),(1,2) or (1,-1) and start with (1,2).at n=7A033296
• Triangle read by rows of numbers of paths in a lattice satisfying certain conditions.at n=42A071949
• A convolution triangle of numbers based on A027307.at n=38A110682
• a(0) = 1, a(n) = (2*n^5 + 20*n^3 + 23*n) * 2/15 for n>=1.at n=15A364429