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), (1, 1, -1), (1, 1, 1)}.
A149742
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), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =77a(5) =317a(6) =1415a(7) =6333a(8) =28813a(9) =132839a(10) =617129a(11) =2888359a(12) =13611893a(13) =64397119a(14) =306277069a(15) =1461111375a(16) =6994321849a(17) =33574979779a(18) =161548792499a(19) =779091251847
External references
- oeis: A149742