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, 1, 1), (0, 1, 1), (1, -1, 1), (1, 1, -1)}.
A149027
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, 1, 1), (0, 1, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =39a(5) =143a(6) =645a(7) =2603a(8) =12089a(9) =51843a(10) =244625a(11) =1085225a(12) =5172639a(13) =23504709a(14) =112876019a(15) =521562001a(16) =2517993407a(17) =11779732141a(18) =57108894755a(19) =269728321329
External references
- oeis: A149027