206979

Appears in sequences

• 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, 1), (-1, 1, 0), (0, 0, -1), (1, 0, 0), (1, 1, -1)}.at n=13A148041
• a(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 343) or the same sequence for the mesh patterns (12, 349), (12, 373), (12, 469).at n=12A289611