A027147 a(n) = A027144(2n, n-2).

1, 12, 56, 480, 2040, 16576, 69888, 557568, 2361600, 18675712, 79613952, 626409472, 2686867456, 21071708160, 90875494400, 711081984000, 3081088991232, 24069137760256, 104712901754880, 816979824869376, 3566715303624704, 27800440481513472, 121738713372819456, 948129286114508800

Offset: 2

Author

Clark Kimberling

Keywords

• nonn

Extensions

More terms from Sean A. Irvine, Oct 24 2019