2187664

Appears in sequences

• Number of asymmetric trees with n nodes (also called identity trees).at n=25A000220
• 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, -1, 0), (-1, 0, -1), (1, 0, 0), (1, 0, 1), (1, 1, 1)}.at n=10A151174