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, 0, -1), (1, 0, 1), (1, 1, -1)}.
A149422
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, 0, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =56a(5) =208a(6) =996a(7) =4078a(8) =19847a(9) =86165a(10) =422862a(11) =1903766a(12) =9391229a(13) =43308943a(14) =214368865a(15) =1005327565a(16) =4987734204a(17) =23678524804a(18) =117672616437a(19) =563791036407
External references
- oeis: A149422