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, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149691
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, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =271a(6) =1163a(7) =4975a(8) =21989a(9) =97645a(10) =439891a(11) =1996779a(12) =9140657a(13) =42072121a(14) =194850683a(15) =906555605a(16) =4235833685a(17) =19866026823a(18) =93492032031a(19) =441290511949
External references
- oeis: A149691