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

3,1

Links

Table of n, a(n) for n=3..22.

Crossrefs

Sequence in context: A022684 A297752 A027275 * A125387 A126545 A193168

Adjacent sequences: A027257 A027258 A027259 * A027261 A027262 A027263

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 26 2019

Status

approved