id:A066973 - OEIS Search Results

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phi(binomial(2n,n)).

+0
2

1, 2, 8, 24, 72, 240, 960, 2880, 15360, 69120, 165888, 912384, 3041280, 9123840, 34062336, 127733760, 479001600, 1596672000, 6386688000, 22992076800, 102187008000, 429185433600, 1755758592000, 6730407936000, 28267713331200 (list; graph; listen)

	OFFSET	`1,2`
	MAPLE	`with(numtheory):with(combinat):a:=n->phi(binomial(2*n, n)): seq(a(n), n=1..25); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 05 2007`
	CROSSREFS	`Adjacent sequences: A066970 A066971 A066972 this_sequence A066974 A066975 A066976` `Sequence in context: A050242 A045697 A131569 this_sequence A130495 A026070 A093833`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 26 2002`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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