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Search: id:A125824
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| 1, 3, 9, 9, 27, 81, 81, 243, 729, 243, 729, 2187, 2187, 6561, 19683, 19683, 59049, 177147, 59049, 177147, 531441, 531441, 1594323, 4782969, 4782969, 14348907, 43046721, 4782969, 14348907, 43046721, 43046721, 129140163, 387420489
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OFFSET
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0,2
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FORMULA
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a(0)=1, a(3n+2)=3^(n+2)*a(n), a(3n+1)=3^(n+1)*a(n), a(3n)=3^n*a(n) ; a(n)=3^A089792(n)
a(n)=denominator((1/(2*pi))*int(exp(i*3*t)(-((pi-t)/i)^n),t,0,2*pi)), i=sqrt(-1); a(n)=3^A089792(n); - Paul Barry (pbarry(AT)wit.ie), Apr 02 2007
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PROGRAM
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(PARI) a(n)=denominator(n!/3^n)
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CROSSREFS
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Sequence in context: A099720 A162349 A072404 this_sequence A038227 A080292 A114022
Adjacent sequences: A125821 A125822 A125823 this_sequence A125825 A125826 A125827
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KEYWORD
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nonn,frac
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 06 2007
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