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, 0), (1, 0, -1)}.
A149865
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, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =40a(5) =131a(6) =452a(7) =1572a(8) =5692a(9) =21031a(10) =79417a(11) =302186a(12) =1169670a(13) =4574232a(14) =18083006a(15) =71931274a(16) =288765763a(17) =1166819602a(18) =4744411047a(19) =19384558408a(20) =79648672433a(21) =328754264401
External references
- oeis: A149865