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Search: id:A027250
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| A027250 |
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a(n) = Sum{T(n,k)*T(n,k+3), 0<=k<=n-3, T given by A026780. |
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| 1, 12, 95, 639, 3917, 23377, 132553, 762434, 4201955, 23901906, 130453555, 740755012, 4035754137, 22952934073, 125259143235, 714206660342
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