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, 0), (-1, 0, 0), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149426
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, 0), (-1, 0, 0), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =43a(5) =165a(6) =653a(7) =2554a(8) =10353a(9) =43406a(10) =181669a(11) =766756a(12) =3300981a(13) =14302542a(14) =62073273a(15) =272025803a(16) =1201510207a(17) =5316833661a(18) =23625660731a(19) =105633697288a(20) =473708034708
External references
- oeis: A149426