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, 0), (1, -1, -1), (1, 1, 0)}.
A148521
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, 0), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =17a(5) =40a(6) =133a(7) =359a(8) =1205a(9) =3516a(10) =12233a(11) =37178a(12) =130260a(13) =409452a(14) =1451523a(15) =4699397a(16) =16810715a(17) =55338236a(18) =199009269a(19) =666159598a(20) =2410618728a(21) =8180797010a(22) =29727470755a(23) =101876698914a(24) =371570011482
External references
- oeis: A148521