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A026949
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a(n) = Sum{T(n,k)*T(n,k+3)}, 0<=k<=n-3, T given by A026374.
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0
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1, 12, 83, 630, 3171, 21672, 97482, 639180, 2730615, 17543196, 72932904, 463291920, 1895949055, 11961944400, 48478715240, 304543085040
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