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, 0, 1), (-1, 1, 0), (0, -1, 1), (1, 1, 0)}.
A149256
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, 0, 1), (-1, 1, 0), (0, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =38a(5) =140a(6) =504a(7) =1925a(8) =7447a(9) =29140a(10) =116063a(11) =465686a(12) =1886580a(13) =7699620a(14) =31591428a(15) =130409841a(16) =540829033a(17) =2252289774a(18) =9414955270a(19) =39488656222a(20) =166128887766a(21) =700747249258
External references
- oeis: A149256