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, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148631
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, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =22a(5) =57a(6) =199a(7) =625a(8) =2229a(9) =7485a(10) =26938a(11) =97060a(12) =354675a(13) =1302555a(14) =4885335a(15) =18414669a(16) =69718897a(17) =266500109a(18) =1028625972a(19) =3976482838a(20) =15457149273a(21) =60534518818a(22) =237948496783a(23) =937429791783
External references
- oeis: A148631