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A066625 Concatenation of factorials in increasing order up to the n-th and then in decreasing order. 0
1, 121, 12621, 12624621, 1262412024621, 1262412072012024621, 12624120720504072012024621, 12624120720504040320504072012024621, 1262412072050404032036288040320504072012024621, 12624120720504040320362880362880036288040320504072012024621 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

MATHEMATICA

fr[n_]:=Module[{f=Factorial[Range[n]]}, FromDigits[Flatten[ IntegerDigits/@ Join[ f, Reverse[ Most[f]]]]]]; Array[fr, 10] (* Harvey P. Dale, Oct 21 2013 *)

CROSSREFS

Sequence in context: A030174 A180153 A178510 * A078277 A178512 A050740

Adjacent sequences:  A066622 A066623 A066624 * A066626 A066627 A066628

KEYWORD

easy,nonn,base

AUTHOR

Amarnath Murthy, Dec 25 2001

EXTENSIONS

More terms from Sascha Kurz, Mar 23 2002

One more term from Harvey P. Dale, Oct 21 2013

STATUS

approved

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Last modified August 19 18:30 EDT 2022. Contains 356229 sequences. (Running on oeis4.)