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), (1, -1, -1), (1, 1, -1), (1, 1, 1)}.
A149619
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), (1, -1, -1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =65a(5) =241a(6) =1075a(7) =4449a(8) =20177a(9) =87403a(10) =402719a(11) =1796813a(12) =8377087a(13) =38115979a(14) =179267151a(15) =827203021a(16) =3917268679a(17) =18268401439a(18) =86985225021a(19) =409018283113
External references
- oeis: A149619