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)}.
A150561
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) =7a(3) =26a(4) =106a(5) =444a(6) =1933a(7) =8569a(8) =38662a(9) =176571a(10) =814756a(11) =3789711a(12) =17747746a(13) =83581901a(14) =395515089a(15) =1879283001a(16) =8961200822a(17) =42863428919a(18) =205586469462a(19) =988449516909
External references
- oeis: A150561