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, 1), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.
A149676
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, 1), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =65a(5) =263a(6) =1099a(7) =4611a(8) =19819a(9) =86035a(10) =376603a(11) =1662343a(12) =7388127a(13) =33010177a(14) =148236927a(15) =668470943a(16) =3026007299a(17) =13743999351a(18) =62608319811a(19) =285986666109
External references
- oeis: A149676