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, 1), (-1, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149559
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, 1), (-1, 1, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =59a(5) =193a(6) =901a(7) =3271a(8) =15423a(9) =59125a(10) =282045a(11) =1121031a(12) =5385941a(13) =21944461a(14) =106065745a(15) =440324873a(16) =2137233317a(17) =9002205719a(18) =43846771609a(19) =186858401265a(20) =912545397723
External references
- oeis: A149559