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), (1, 0, -1), (1, 0, 1), (1, 1, 0)}.
A150722
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), (1, 0, -1), (1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =28a(4) =120a(5) =487a(6) =2164a(7) =9332a(8) =42459a(9) =189347a(10) =875147a(11) =3987803a(12) =18636188a(13) =86192575a(14) =406149540a(15) =1898912298a(16) =9005660987a(17) =42453474667a(18) =202375900257a(19) =960205508652
External references
- oeis: A150722