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A027289 a(n) = Sum_{k=0..floor(n/2)-1} T(n,k) * T(n,k+2), with T given by A026009. 1
1, 3, 18, 55, 264, 847, 3744, 12465, 52868, 180895, 749220, 2617173, 10680656, 37915317, 153240864, 551019963, 2212417314, 8038946075, 32129224712, 117758845827, 469105048654, 1731917060158, 6882935960496, 25569740611270, 101442831429264, 378875492015643 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..27.

CROSSREFS

Sequence in context: A027334 A130505 A222204 * A061317 A190313 A139362

Adjacent sequences: A027286 A027287 A027288 * A027290 A027291 A027292

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 26 2019

STATUS

approved

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Last modified February 8 12:47 EST 2023. Contains 360138 sequences. (Running on oeis4.)