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, 0), (-1, -1, 1), (0, 0, 1), (0, 1, -1), (1, 0, 0)}.
A149868
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, 0), (-1, -1, 1), (0, 0, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =41a(5) =139a(6) =494a(7) =1771a(8) =6626a(9) =25477a(10) =99704a(11) =394028a(12) =1583784a(13) =6453726a(14) =26532762a(15) =109902780a(16) =459422070a(17) =1935495454a(18) =8199912534a(19) =34928922249a(20) =149648443966a(21) =644305507731
External references
- oeis: A149868