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A047683
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a(n) = 5^(2*n)*(5^(2*n)-1)*Bernoulli(2*n)/(2*n).
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3
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50, -3250, 968750, -635781250, 722480468750, -1257228613281250, 3104408581542968750, -10320446545227050781250, 44440884525382995605468750, -240617847532228950500488281250, 1599915691073966364860534667968750, -12816452064605408400845527648925781250
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