A027015 a(n) = A027011(2n, n+4).

1, 12, 343, 3864, 26990, 140455, 599801, 2228414, 7486615, 23370193, 69141497, 196766283, 544680787, 1478898009, 3962865228, 10526310127, 27802386717, 73170829088, 192150938490, 503938185601, 1320621962194, 3459303317894, 9059231670566, 23721098636714

Offset: 4

Author

Clark Kimberling

Keywords

• nonn

Extensions

More terms from Sean A. Irvine, Oct 21 2019