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, 0, -1), (1, -1, 1), (1, 1, 0)}.
A149387
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, 0, -1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =49a(5) =191a(6) =815a(7) =3469a(8) =15307a(9) =68013a(10) =307268a(11) =1398768a(12) =6428729a(13) =29727505a(14) =138333374a(15) =646828034a(16) =3038128475a(17) =14323832261a(18) =67765179616a(19) =321553421700
External references
- oeis: A149387