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, 1), (-1, 1, 1), (1, 1, -1), (1, 1, 1)}.
A149653
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, 1), (-1, 1, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =75a(5) =259a(6) =1295a(7) =4865a(8) =24325a(9) =96141a(10) =480705a(11) =1963005a(12) =9815025a(13) =40997637a(14) =204988185a(15) =870599775a(16) =4352998875a(17) =18725337979a(18) =93626689895a(19) =406867433759
External references
- oeis: A149653