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, 0, 1), (1, 1, -1)}.
A149017
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, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =35a(5) =124a(6) =510a(7) =1996a(8) =8486a(9) =35018a(10) =152208a(11) =648852a(12) =2864100a(13) =12477480a(14) =55706440a(15) =246442952a(16) =1109909256a(17) =4966324677a(18) =22522279875a(19) =101658778771a(20) =463622222653
External references
- oeis: A149017