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, 0, 0), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
A148420
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, 0, 0), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =18a(5) =56a(6) =190a(7) =682a(8) =2597a(9) =9758a(10) =37827a(11) =150497a(12) =606474a(13) =2458196a(14) =10128201a(15) =42193871a(16) =176803654a(17) =746541792a(18) =3180626863a(19) =13624001336a(20) =58635439526a(21) =253891846471
External references
- oeis: A148420