A125562 - OEIS

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A125562

Denominator of (2n+1)!/3^n.

1, 1, 3, 3, 1, 3, 3, 3, 9, 3, 3, 9, 9, 1, 3, 3, 3, 9, 3, 3, 9, 9, 3, 9, 9, 9, 27, 3, 3, 9, 9, 3, 9, 9, 9, 27, 9, 9, 27, 27, 1, 3, 3, 3, 9, 3, 3, 9, 9, 3, 9, 9, 9, 27, 3, 3, 9, 9, 3, 9, 9, 9, 27, 9, 9, 27, 27, 3, 9, 9, 9, 27, 9, 9, 27, 27, 9, 27, 27, 27, 81, 3, 3, 9, 9, 3, 9, 9, 9, 27, 9, 9, 27, 27, 3, 9, 9 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	FORMULA	`for n>=1, a(9n)=a(3n) ; a(9n+1)=a(3n) ; a(9n+2)=3a(3n) ; a(9n+3)=3a(3n) ; a(9n+4)=a(n) ; a(9n+5)=3a(n) ; a(9n+6)=3a(n) ; a(9n+7)=3a(n) ; a(9n+8)=9a(n)`
	PROG	`(PARI) a(n)=denominator((2*n+1)!/3^n)`
	CROSSREFS	`Sequence in context: A083953 A198260 A066400 * A092040 A161200 A110766` `Adjacent sequences: A125559 A125560 A125561 * A125563 A125564 A125565`
	KEYWORD	`nonn,frac`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 01 2007`

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Last modified February 15 08:04 EST 2012. Contains 205717 sequences.