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), (0, 0, 1), (0, 1, 0), (1, 1, -1), (1, 1, 0)}.
A151128
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), (0, 0, 1), (0, 1, 0), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =45a(4) =195a(5) =875a(6) =4019a(7) =18769a(8) =88737a(9) =423485a(10) =2035845a(11) =9844041a(12) =47823225a(13) =233223195a(14) =1141000497a(15) =5597006081a(16) =27517037763a(17) =135543341549a(18) =668754328733
External references
- oeis: A151128