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A026989
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a(n) = Sum{T(n,k)*T(n,k+3)}, 0<=k<=n-3, T given by A026681.
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0
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1, 14, 115, 660, 3805, 20520, 109779, 551774, 2921313, 14482320, 71576096, 349292330, 1804636693, 8745745676, 42107640345, 203559063050
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