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A027209
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Sum{T(n,k)*T(n,k+2), 0<=k<=n-2, T given by A026725.
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0
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1, 7, 34, 173, 741, 3549, 14670, 68683, 279715, 1294598, 5233060, 24052965, 96822587, 442972139, 1778697948, 8110611295, 32516501991, 147897243768, 592346459071
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