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, 0), (0, 1, 1), (1, -1, 1), (1, 1, -1)}.
A149022
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, 0), (0, 1, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =37a(5) =137a(6) =563a(7) =2295a(8) =9845a(9) =42569a(10) =187241a(11) =829113a(12) =3716741a(13) =16801519a(14) =76590999a(15) =350951923a(16) =1616427105a(17) =7480593825a(18) =34783933175a(19) =162388326717a(20) =760610219037
External references
- oeis: A149022