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, 1, -1), (1, 1, 1)}.
A149609
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, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =63a(5) =223a(6) =1007a(7) =3987a(8) =17731a(9) =72801a(10) =332205a(11) =1419247a(12) =6445743a(13) =27950963a(14) =128654771a(15) =569100817a(16) =2614464453a(17) =11656479779a(18) =53994824919a(19) =243589190703
External references
- oeis: A149609