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, -1), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
A149215
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, -1), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =42a(5) =136a(6) =591a(7) =2082a(8) =9311a(9) =34685a(10) =157638a(11) =608881a(12) =2797083a(13) =11084537a(14) =51304738a(15) =207277076a(16) =964911964a(17) =3957470838a(18) =18504551737a(19) =76820763679a(20) =360469021179
External references
- oeis: A149215