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, 0), (-1, 1, -1), (0, 1, 1), (1, -1, -1)}.
A148216
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, 0), (-1, 1, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =31a(6) =89a(7) =283a(8) =889a(9) =2709a(10) =9310a(11) =31112a(12) =104065a(13) =364051a(14) =1285706a(15) =4480766a(16) =16159471a(17) =58587795a(18) =211307424a(19) =776950804a(20) =2879991777a(21) =10620963211a(22) =39736522651a(23) =149628422843a(24) =561644678355
External references
- oeis: A148216