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), (1, -1, -1), (1, 1, 0)}.
A149120
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), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =32a(5) =103a(6) =361a(7) =1307a(8) =4792a(9) =18033a(10) =68631a(11) =265451a(12) =1034256a(13) =4083197a(14) =16204618a(15) =64889975a(16) =261337858a(17) =1058251013a(18) =4309632977a(19) =17616277293a(20) =72364546556a(21) =298151009423
External references
- oeis: A149120