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A037976
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C(4*n,2*n)/4-(-1)^n*C(2*n,n)/4+(1-(-1)^n)*C(2*n,n)^2/4.
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0
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0, 4, 16, 436, 3200, 78004, 675808, 15919320, 150266880, 3450748180, 34461586016, 774842070600, 8061900244736, 178065876017176, 1912172640160960, 41596867935469936, 458156035085377536
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