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), (0, 0, 1), (1, 0, -1), (1, 1, 0)}.
A150186
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), (0, 0, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =74a(5) =283a(6) =1118a(7) =4458a(8) =18351a(9) =76591a(10) =321854a(11) =1374658a(12) =5918280a(13) =25602941a(14) =111845103a(15) =491194938a(16) =2164765075a(17) =9602560058a(18) =42758955587a(19) =190902880964a(20) =856275025748
External references
- oeis: A150186