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), (0, 1, 0), (1, -1, -1), (1, 0, 1)}.
A150009
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), (0, 1, 0), (1, -1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =60a(5) =226a(6) =878a(7) =3492a(8) =14250a(9) =58967a(10) =247213a(11) =1050601a(12) =4505573a(13) =19469075a(14) =84748283a(15) =371246371a(16) =1635403490a(17) =7239344680a(18) =32181864157a(19) =143633949423a(20) =643403070160
External references
- oeis: A150009