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, 0), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
A148992
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, 0), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =116a(6) =453a(7) =1750a(8) =7109a(9) =28986a(10) =121305a(11) =510680a(12) =2183305a(13) =9395165a(14) =40817884a(15) =178419362a(16) =785115490a(17) =3472402376a(18) =15435999223a(19) =68908079136a(20) =308841287833
External references
- oeis: A148992