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, 0, 1), (0, 0, 1), (1, 0, -1), (1, 1, 0)}.
A150552
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, 0, 1), (0, 0, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =105a(5) =442a(6) =1920a(7) =8525a(8) =38480a(9) =175927a(10) =812470a(11) =3783046a(12) =17733619a(13) =83598750a(14) =395976575a(15) =1883262667a(16) =8988385280a(17) =43031566795a(18) =206568684223a(19) =993983881425
External references
- oeis: A150552