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, 0, 0), (0, -1, 1), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
A149472
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, 0, 0), (0, -1, 1), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =55a(5) =218a(6) =938a(7) =4066a(8) =18186a(9) =82109a(10) =376555a(11) =1739578a(12) =8112029a(13) =38060074a(14) =179648530a(15) =851992988a(16) =4058089997a(17) =19398498945a(18) =93031571639a(19) =447417004233
External references
- oeis: A149472