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Search: id:A141722
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| 1, 25, 121, 505, 2041, 8185, 32761, 131065, 524281, 2097145, 8388601, 33554425, 134217721, 536870905, 2147483641, 8589934585
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OFFSET
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0,2
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FORMULA
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a(n)=8*4^n-7. G.f.: (1+20x)/((1-x)(1-4x)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 13 2008]
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CROSSREFS
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Adjacent sequences: A141719 A141720 A141721 this_sequence A141723 A141724 A141725
Sequence in context: A031151 A016970 A062938 this_sequence A090159 A025283 A076433
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Sep 12 2008
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 13 2008
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 13 2008
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