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, 0, -1), (0, 0, 1), (1, 0, -1), (1, 1, 1)}.
A150720
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, 0, -1), (0, 0, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =28a(4) =118a(5) =488a(6) =2136a(7) =9380a(8) =42070a(9) =190154a(10) =870416a(11) =4008548a(12) =18600334a(13) =86701702a(14) =406264347a(15) =1911554475a(16) =9028250128a(17) =42775979989a(18) =203243898732a(19) =968197218325
External references
- oeis: A150720