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, 1, -1), (0, 0, 1), (1, 0, 0), (1, 1, -1)}.
A149971
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, 1, -1), (0, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =55a(5) =202a(6) =788a(7) =3164a(8) =13059a(9) =55076a(10) =236334a(11) =1029234a(12) =4535902a(13) =20200270a(14) =90758717a(15) =410933676a(16) =1873206910a(17) =8589677654a(18) =39597122282a(19) =183397246362a(20) =853021434437
External references
- oeis: A149971