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, -1), (-1, 1, 1), (1, -1, 1), (1, 1, 0)}.
A149231
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, -1), (-1, 1, 1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =48a(5) =153a(6) =747a(7) =2663a(8) =13154a(9) =49954a(10) =248116a(11) =981505a(12) =4888135a(13) =19894230a(14) =99231106a(15) =412409034a(16) =2058919189a(17) =8695689778a(18) =43436137417a(19) =185802391314a(20) =928422184006
External references
- oeis: A149231