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), (0, 1, 1), (1, -1, 0)}.
A148817
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), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =89a(6) =317a(7) =1145a(8) =4349a(9) =16621a(10) =65495a(11) =260108a(12) =1050890a(13) =4281295a(14) =17645035a(15) =73260909a(16) =306735774a(17) =1292685198a(18) =5481962505a(19) =23378481403a(20) =100196337941a(21) =431455650979
External references
- oeis: A148817