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), (0, 1, 1), (1, -1, -1), (1, 1, 0)}.
A150151
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), (0, 1, 1), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =74a(5) =274a(6) =1103a(7) =4366a(8) =18185a(9) =75130a(10) =320230a(11) =1358179a(12) =5888175a(13) =25443837a(14) =111664081a(15) =489304865a(16) =2168190791a(17) =9601100796a(18) =42882613069a(19) =191466467335a(20) =860762279600
External references
- oeis: A150151