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, -1)}.
A149399
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, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =51a(5) =170a(6) =767a(7) =2865a(8) =13303a(9) =52106a(10) =246262a(11) =999415a(12) =4781050a(13) =19881284a(14) =95906783a(15) =406016883a(16) =1970864990a(17) =8460785652a(18) =41264143733a(19) =179101755477a(20) =876723078894
External references
- oeis: A149399