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, 1), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.
A149716
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, 1), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =71a(5) =297a(6) =1301a(7) =5723a(8) =25809a(9) =117441a(10) =539487a(11) =2497203a(12) =11641745a(13) =54540565a(14) =256723897a(15) =1213481451a(16) =5755777471a(17) =27383682569a(18) =130648021511a(19) =624862345197
External references
- oeis: A149716