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A027290 a(n) = Sum_{k=0..floor(n/2)-2} T(n,k) * T(n,k+3), with T given by A026009. 1
3, 9, 73, 230, 1335, 4376, 22144, 74766, 351558, 1213965, 5458347, 19181130, 83735127, 298391598, 1276135088, 4599546922, 19380537318, 70514368558, 293838981413, 1077617352348, 4452600188602, 16440039884624, 67481063581593, 250610375841434, 1023303550651792 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

LINKS

Table of n, a(n) for n=4..28.

CROSSREFS

Sequence in context: A102322 A305855 A018576 * A131496 A132294 A032330

Adjacent sequences: A027287 A027288 A027289 * A027291 A027292 A027293

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 26 2019

STATUS

approved

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Last modified January 27 19:49 EST 2023. Contains 359847 sequences. (Running on oeis4.)