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), (0, 1, -1), (1, 0, 1), (1, 1, 0)}.
A150124
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), (0, 1, -1), (1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =69a(5) =250a(6) =924a(7) =3468a(8) =13194a(9) =50602a(10) =195481a(11) =759303a(12) =2961868a(13) =11595975a(14) =45528334a(15) =179189562a(16) =706689736a(17) =2791766580a(18) =11045040490a(19) =43751719084a(20) =173495907556a(21) =688634340547
External references
- oeis: A150124