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A027280 a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A026568. 0
26, 164, 1224, 7664, 51488, 326456, 2126376, 13574046, 87554326, 560845908, 3607790136, 23158545126, 148945375022, 957564479960, 6162874994108, 39672627184498, 255578754020002, 1647166273816172, 10622076015026288, 68529892093271816, 442357250742603624 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

LINKS

Table of n, a(n) for n=3..23.

CROSSREFS

Sequence in context: A042314 A280213 A200874 * A006354 A249292 A279744

Adjacent sequences:  A027277 A027278 A027279 * A027281 A027282 A027283

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 26 2019

STATUS

approved

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Last modified June 30 19:42 EDT 2022. Contains 354945 sequences. (Running on oeis4.)