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, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149703
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, 1, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =69a(5) =281a(6) =1197a(7) =5209a(8) =23213a(9) =104329a(10) =474667a(11) =2174875a(12) =10047419a(13) =46708425a(14) =218395787a(15) =1025909295a(16) =4838930121a(17) =22903904049a(18) =108755859469a(19) =517889675141
External references
- oeis: A149703