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A005017
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Denominator of (binomial(2*n-2,n-1)/n!)^2.
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2
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1, 1, 1, 36, 144, 400, 3600, 2822400, 16257024, 32920473600, 823011840000, 8129341440000, 292656291840000, 3877578804363264, 58642395498086400, 844450495172444160000, 54044831691036426240000
(list; graph; refs; listen; history; internal format)
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