109518

Appears in sequences

• Number of permutations of length n which avoid the patterns 1234, 2431, 4312.at n=20A116765
• 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), (0, 1, -1), (0, 1, 0), (1, 0, 1), (1, 1, -1)}.at n=9A150255