80006116

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 (2,1).at n=9A032349
• Length of list created by n substitutions k -> Range[-abs(k+1), abs(k-1), 2] starting with {0}.at n=18A084078
• Number of paths from (0,0) if n is even, or from (2,1) if n is odd, to (3n,0) that stay in first quadrant (but may touch horizontal axis) and where each step is (2,1), (1,2) or (1,-1).at n=19A137842