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A066625
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Concatenation of factorials in increasing order up to the n-th and then in decreasing order.
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0
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1, 121, 12621, 12624621, 1262412024621, 1262412072012024621, 12624120720504072012024621, 12624120720504040320504072012024621, 1262412072050404032036288040320504072012024621, 12624120720504040320362880362880036288040320504072012024621
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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fr[n_]:=Module[{f=Factorial[Range[n]]}, FromDigits[Flatten[ IntegerDigits/@ Join[ f, Reverse[ Most[f]]]]]]; Array[fr, 10] (* Harvey P. Dale, Oct 21 2013 *)
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CROSSREFS
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KEYWORD
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easy,nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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