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, 1), (-1, 0, 1), (1, 1, -1), (1, 1, 0)}.
A148722
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, 1), (-1, 0, 1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =69a(6) =259a(7) =795a(8) =3045a(9) =9953a(10) =38591a(11) =131327a(12) =513337a(13) =1796525a(14) =7061147a(15) =25224451a(16) =99529133a(17) =361139385a(18) =1429001559a(19) =5248750951a(20) =20813004833a(21) =77196021317a(22) =306604539891
External references
- oeis: A148722