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Search: id:A026988
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| A026988 |
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a(n) = Sum{T(n,k)*T(n,k+2)}, 0<=k<=n-2, T given by A026681. |
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| 1, 10, 69, 340, 1696, 8774, 44500, 203884, 998953, 5026154, 24474925, 110862660, 540493911, 2706193730, 13062307900, 59214077236, 288140818097
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