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), (1, -1, 1), (1, 0, -1), (1, 1, 1)}.
A149720
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), (1, -1, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =73a(5) =295a(6) =1347a(7) =5829a(8) =27169a(9) =121841a(10) =576633a(11) =2652903a(12) =12656631a(13) =59103899a(14) =284233127a(15) =1342659713a(16) =6487766429a(17) =30900283921a(18) =149947936161a(19) =718950320529
External references
- oeis: A149720