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A026978
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a(n) = Sum{T(n,k)*T(n,k+2)}, 0<=k<=n-2, T given by A026659.
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0
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1, 8, 41, 208, 856, 4540, 18527, 86896, 343976, 1794146, 7114521, 33019048, 129946039, 674164700, 2656947487, 12352433072, 48571744683, 251186392774, 988685996629
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