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A027283
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a(n) = Sum{T(n,k)*T(n,k+1)}, 0<=k<=2n-1, T given by A026584.
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0
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0, 6, 26, 206, 1100, 7314, 42920, 274010, 1677332, 10616070, 66290046, 419754586, 2648500908, 16818685050, 106781976774, 680250643910
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