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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
OFFSET
4,1
CROSSREFS
Sequence in context: A102322 A305855 A018576 * A131496 A367429 A132294
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Oct 26 2019
STATUS
approved