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, 0, 1), (-1, 1, -1), (1, 0, 0), (1, 0, 1)}.
A150310
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, 0, 1), (-1, 1, -1), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =21a(4) =85a(5) =294a(6) =1281a(7) =4784a(8) =21615a(9) =84503a(10) =390514a(11) =1574592a(12) =7385698a(13) =30449007a(14) =144314993a(15) =605050553a(16) =2889602650a(17) =12275638743a(18) =58966155199a(19) =253181758625
External references
- oeis: A150310