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Search: id:A141725
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| 1, 13, 61, 253, 1021, 4093, 16381, 65533, 262141, 1048573, 4194301, 16777213, 67108861, 268435453, 1073741821, 4294967293, 17179869181, 68719476733, 274877906941, 1099511627773, 4398046511101, 17592186044413, 70368744177661
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OFFSET
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1,2
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COMMENT
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Inverse binomial transform yields A003946 with A003946(1)=4 deleted. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 13 2008]
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FORMULA
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a(n) = 10*A001045(2n) + A001045(2n+1).
a(n)=4a(n-1)+9, a(0)=1. a(n)=A036563(2n+2).
G.f.: (1+8x)/((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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Sequence in context: A139880 A127876 A047673 this_sequence A147185 A122885 A135535
Adjacent sequences: A141722 A141723 A141724 this_sequence A141726 A141727 A141728
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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 13 2008
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EXTENSIONS
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Edited by njas, Sep 13 2008
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 13 2008
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