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), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148881
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), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =30a(5) =96a(6) =403a(7) =1466a(8) =6439a(9) =25426a(10) =114604a(11) =476405a(12) =2187128a(13) =9410849a(14) =43797442a(15) =193201730a(16) =908410384a(17) =4083431156a(18) =19351522407a(19) =88275335700a(20) =420946248654
External references
- oeis: A148881