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A027289
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a(n) = Sum{T(n,k)*T(n,k+2)}, 0<=k<=[ n/2 ]-1, T given by A026009.
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0
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1, 3, 18, 55, 264, 847, 3744, 12465, 52868, 180895, 749220, 2617173, 10680656, 37915317, 153240864, 551019963, 2212417314, 8038946075, 32129224712, 117758845827, 469105048654
(list; graph; refs; listen; history; internal format)
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