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, 0, -1), (0, 1, -1), (1, 1, 1)}.
A149656
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, 0, -1), (0, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =53a(5) =233a(6) =909a(7) =3361a(8) =14885a(9) =61241a(10) =242717a(11) =1085329a(12) =4598229a(13) =18926889a(14) =85303757a(15) =368267009a(16) =1552593669a(17) =7041525529a(18) =30802363261a(19) =132037599601a(20) =601853765429
External references
- oeis: A149656