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Search: id:A027268
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| A027268 |
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a(n) = Sum{T(n,k)*T(n,k+1)}, 0<=k<=2n-1, T given by A026536. |
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| 0, 6, 20, 180, 644, 5502, 20292, 174456, 654632, 5673140, 21528000, 187675644, 717800628, 6284986554, 24178479500, 212408191568, 820811282352
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