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 A027203 a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026714. 1
 1, 10, 75, 450, 2814, 15202, 89623, 466252, 2677281, 13691160, 77546684, 393047294, 2209036094, 11140807218, 62325916869, 313402240000, 1748294223916, 8775335427968, 48864101440273, 244988564184682, 1362584143931457 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 LINKS Table of n, a(n) for n=2..22. MAPLE A027203 := proc(n) add( A026714(n, k)*A026714(n, k+2), k=0..n-2) ; end proc: seq(A027203(n), n=2..30) ; # R. J. Mathar, Oct 21 2019 CROSSREFS Sequence in context: A283238 A316462 A022734 * A291003 A305784 A053464 Adjacent sequences: A027200 A027201 A027202 * A027204 A027205 A027206 KEYWORD nonn AUTHOR Clark Kimberling EXTENSIONS Name corrected by Sean A. Irvine, Oct 21 2019 More terms from Ray Chandler, Oct 22 2019 STATUS approved

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Last modified July 15 11:01 EDT 2024. Contains 374332 sequences. (Running on oeis4.)