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), (0, 1, -1), (1, 0, 1)}.
A149320
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), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =37a(5) =139a(6) =528a(7) =1941a(8) =7746a(9) =31595a(10) =127242a(11) =525422a(12) =2225527a(13) =9398419a(14) =39954756a(15) =172778903a(16) =750568243a(17) =3264066086a(18) =14327170089a(19) =63317552889a(20) =280166179079
External references
- oeis: A149320