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), (0, 1, -1), (1, 0, 0)}.
A148595
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), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =57a(6) =196a(7) =668a(8) =2393a(9) =8767a(10) =32685a(11) =123971a(12) =475817a(13) =1847493a(14) =7237415a(15) =28604348a(16) =113831462a(17) =456068443a(18) =1837914610a(19) =7444900802a(20) =30305229024a(21) =123883817163a(22) =508434835137
External references
- oeis: A148595