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), (-1, 1, 0), (0, 0, -1), (1, 0, 1)}.
A148680
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), (-1, 1, 0), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =73a(6) =245a(7) =793a(8) =2815a(9) =10075a(10) =36727a(11) =137411a(12) =511099a(13) =1902023a(14) =7265539a(15) =27944559a(16) =107626613a(17) =418427913a(18) =1633245101a(19) =6388652625a(20) =25192946761a(21) =99781420877a(22) =395823365473
External references
- oeis: A148680