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, 0), (1, 1, -1)}.
A150086
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, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =19a(4) =66a(5) =238a(6) =908a(7) =3529a(8) =14135a(9) =57331a(10) =236815a(11) =987215a(12) =4171451a(13) =17743854a(14) =76236546a(15) =329234054a(16) =1432684708a(17) =6260115889a(18) =27520807300a(19) =121392770521a(20) =538131641681
External references
- oeis: A150086