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, 0), (0, 1, 1), (1, 0, 0)}.
A149988
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, 0), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =57a(5) =197a(6) =727a(7) =2749a(8) =10427a(9) =40413a(10) =160104a(11) =635452a(12) =2540981a(13) =10308191a(14) =41986778a(15) =171455171a(16) =706159913a(17) =2922368795a(18) =12112409612a(19) =50441850877a(20) =210971954246a(21) =883890089373
External references
- oeis: A149988