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, 0, 0), (0, -1, 1), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
A148996
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, 0, 0), (0, -1, 1), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =119a(6) =454a(7) =1779a(8) =7152a(9) =29311a(10) =122013a(11) =514390a(12) =2192976a(13) =9435593a(14) =40927132a(15) =178767188a(16) =785677788a(17) =3471969333a(18) =15417894851a(19) =68766083151a(20) =307921250078
External references
- oeis: A148996