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A027210 a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026725. 1
1, 9, 57, 298, 1545, 7126, 34603, 151633, 714481, 3049328, 14131926, 59385159, 272409611, 1133433579, 5163641033, 21341122875, 96751092786, 397978832144, 1797722306693, 7369285976135, 33195299823112, 135723491400062, 610027809595308, 2489247495517382, 11168400384253936 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..27.

MAPLE

A027210 := proc(n)

    add( A026725(n, k)*A026725(n, k+3), k=0..n-3) ;

end proc: # R. J. Mathar, Oct 21 2019

CROSSREFS

Sequence in context: A231315 A338080 A064838 * A192054 A045720 A014916

Adjacent sequences:  A027207 A027208 A027209 * A027211 A027212 A027213

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

Name corrected by R. J. Mathar, Oct 21 2019

More terms from Sean A. Irvine, Oct 24 2019

STATUS

approved

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Last modified September 28 06:57 EDT 2021. Contains 347703 sequences. (Running on oeis4.)