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A027980
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Sum{T(n,k)*T(n,2n-k)}, 0<=k<=n-1, T given by A027960.
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0
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1, 13, 48, 176, 580, 1844, 5667, 17047, 50404, 147090, 424686, 1215528, 3453733, 9752641, 27393240, 76587284, 213260152, 591707612, 1636514439, 4513276555, 12414985996, 34071252918, 93305816418, 255027755856
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