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, 1), (-1, 1, 0), (0, 1, -1), (1, 0, 0)}.
A148593
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, 1), (-1, 1, 0), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =57a(6) =194a(7) =650a(8) =2287a(9) =8247a(10) =30240a(11) =113165a(12) =429076a(13) =1647654a(14) =6395755a(15) =25060015a(16) =98980363a(17) =393905643a(18) =1577464918a(19) =6354456606a(20) =25732494494a(21) =104690838017a(22) =427789036689
External references
- oeis: A148593