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A131491 2*prime(n)!. 0
4, 12, 240, 10080, 79833600, 12454041600, 711374856192000, 243290200817664000, 51704033477769953280000, 17683523987479403909087232000000, 16445677308355845635451125760000000, 27527506182452690092631959163161804800000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

FORMULA

a(n) = 2*A039716(n) = 2*A000142[A000040(n)]. - R. J. Mathar, Jul 31 2007

MATHEMATICA

2*Prime[Range[15]]! (* Harvey P. Dale, Dec 19 2011 *)

CROSSREFS

Sequence in context: A175718 A076030 A202859 * A286881 A291098 A009506

Adjacent sequences:  A131488 A131489 A131490 * A131492 A131493 A131494

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto, Jul 29 2007

EXTENSIONS

More terms from Harvey P. Dale, Dec 19 2011

STATUS

approved

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Last modified September 22 08:09 EDT 2021. Contains 347605 sequences. (Running on oeis4.)