A027260 a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A025177.

24, 232, 2136, 19282, 172316, 1531362, 13566288, 119972214, 1059985776, 9361450868, 82670528056, 730149455646, 6450340708168, 57003101680376, 503941824270112, 4456975487538614, 39435161261004840, 349069538338480040, 3091176867811031656, 27385210981926235494

Offset: 3

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A025177.

Extensions

More terms from Sean A. Irvine, Oct 26 2019