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A116447
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a(2n) = n, a(2n+1) = n!.
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0
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0, 1, 1, 1, 2, 2, 3, 6, 4, 24, 5, 120, 6, 720, 7, 5040, 8, 40320, 9, 362880, 10, 3628800, 11, 39916800, 12, 479001600, 13, 6227020800, 14, 87178291200, 15, 1307674368000, 16, 20922789888000, 17, 355687428096000, 18, 6402373705728000, 19, 121645100408832000
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OFFSET
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0,5
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LINKS
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MATHEMATICA
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With[{nn=20}, Riffle[Range[0, nn], Range[0, nn]!]] (* Harvey P. Dale, Jan 09 2016 *)
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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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EXTENSIONS
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STATUS
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approved
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