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, 1, 0), (0, 1, 1), (1, 0, 0), (1, 1, -1)}.
A150253
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, 1, 0), (0, 1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =22a(4) =85a(5) =346a(6) =1440a(7) =6159a(8) =26815a(9) =118327a(10) =528550a(11) =2380917a(12) =10818029a(13) =49483614a(14) =227664763a(15) =1052925406a(16) =4891242953a(17) =22815517629a(18) =106805211439a(19) =501601354770
External references
- oeis: A150253