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, -1), (1, 0, -1), (1, 0, 1)}.
A149149
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, -1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =38a(5) =111a(6) =489a(7) =1611a(8) =7292a(9) =25865a(10) =119229a(11) =444481a(12) =2075488a(13) =8019353a(14) =37805228a(15) =150069461a(16) =712667390a(17) =2889197265a(18) =13800198063a(19) =56900245013a(20) =273057703416
External references
- oeis: A149149