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A127230
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a(n) = (2n)! - 1.
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5
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1, 23, 719, 40319, 3628799, 479001599, 87178291199, 20922789887999, 6402373705727999, 2432902008176639999, 1124000727777607679999, 620448401733239439359999, 403291461126605635583999999, 304888344611713860501503999999, 265252859812191058636308479999999
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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Table[(2n)! - 1, {n, 1, 30}]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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