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A167367
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a(n) = sigma(n!!) where n!! is A006882(n).
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3
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1, 1, 3, 4, 15, 24, 124, 192, 1020, 1920, 12264, 23040, 159666, 322560, 2555280, 5041344, 40893840, 90744192, 761260368, 1814883840, 15732804296, 38900010240, 377587663200, 933600245760, 9087075973248, 23520702965760, 254438142416640
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OFFSET
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0,3
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LINKS
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FORMULA
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MATHEMATICA
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Join[{1}, Array[DivisorSigma[1, #!! ]&, 50, 1]]
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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