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, 0, -1), (1, 1, -1), (1, 1, 1)}.
A149726
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, 0, -1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =75a(5) =289a(6) =1313a(7) =5581a(8) =25945a(9) =114835a(10) =540599a(11) =2453645a(12) =11667077a(13) =53909213a(14) =258252995a(15) =1208508337a(16) =5821455827a(17) =27500611031a(18) =133046370535a(19) =633165453019
External references
- oeis: A149726