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, 0, 0), (-1, 1, 1), (0, -1, 0), (0, 1, -1), (1, 0, 0)}.
A148710
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, 0, 0), (-1, 1, 1), (0, -1, 0), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =75a(6) =265a(7) =967a(8) =3612a(9) =13881a(10) =54146a(11) =215339a(12) =867249a(13) =3535563a(14) =14566079a(15) =60517102a(16) =253570701a(17) =1069568322a(18) =4541585236a(19) =19392943306a(20) =83243237160a(21) =359033012893
External references
- oeis: A148710