402409

Appears in sequences

• Number of permutations of length n which avoid the patterns 3412, 4123, 4321.at n=11A116737
• 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), (0, 1, -1), (1, -1, 1), (1, 0, 1)}.at n=11A148945