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, 1, -1), (1, 0, 1), (1, 1, 0)}.
A150052
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, 1, -1), (1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =62a(5) =207a(6) =752a(7) =2640a(8) =9851a(9) =35585a(10) =134948a(11) =496518a(12) =1902953a(13) =7091719a(14) =27380535a(15) =103001513a(16) =399825496a(17) =1514917496a(18) =5904531754a(19) =22498898512a(20) =87970348703a(21) =336742579350
External references
- oeis: A150052