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, 0), (0, 0, -1), (0, 0, 1), (1, 0, 0)}.
A150054
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, 0), (0, 0, -1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =62a(5) =215a(6) =809a(7) =3045a(8) =12046a(9) =47511a(10) =193967a(11) =789448a(12) =3298602a(13) =13740337a(14) =58424144a(15) =247639920a(16) =1067234378a(17) =4585504775a(18) =19976687759a(19) =86779979232a(20) =381432699958
External references
- oeis: A150054