A027304 a(n) = Sum_{k=0..floor((n-5)/2)} T(n,k) * T(n,k+1), with T given by A008315.

5, 14, 126, 384, 2355, 7568, 39545, 131768, 632177, 2162510, 9853892, 34384064, 151498203, 536917884, 2311543325, 8295107912, 35123988977, 127340511540, 532611748052, 1947506206400, 8069978842770, 29721855687264, 122273332182351, 453128454670472

Offset: 5

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A008315.

Extensions

More terms from Sean A. Irvine, Oct 26 2019