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Search: id:A066973
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| 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)
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OFFSET
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1,2
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MAPLE
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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
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PROGRAM
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(Other) sage: [euler_phi(binomial(2*n, n))for n in xrange(1, 26)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 06 2009]
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CROSSREFS
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Sequence in context: A050242 A045697 A131569 this_sequence A130495 A026070 A093833
Adjacent sequences: A066970 A066971 A066972 this_sequence A066974 A066975 A066976
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 26 2002
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