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, -1), (0, 1, 1), (1, -1, 1)}.
A148898
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, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =31a(5) =107a(6) =406a(7) =1561a(8) =6290a(9) =25217a(10) =103791a(11) =432672a(12) =1825167a(13) =7732008a(14) =33153597a(15) =143167821a(16) =621183694a(17) =2709149338a(18) =11892406356a(19) =52405135109a(20) =231698125482
External references
- oeis: A148898