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Search: id:A024075
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| 0, 6, 48, 342, 2400, 16806, 117648, 823542, 5764800, 40353606, 282475248, 1977326742, 13841287200, 96889010406, 678223072848, 4747561509942, 33232930569600, 232630513987206, 1628413597910448, 11398895185373142
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OFFSET
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0,2
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COMMENT
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Numbers n for which the expression 7^n/(n+1) is an integer. - Paolo P. Lava (ppl(AT)spl.at), May 29 2006
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FORMULA
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G.f.: 1/(1-7*x)-1/(1-x). E.g.f.: e^(7*x)-e^x. [From Mohammad K. Azarian (azarian(AT)evansville.edu), Jan 14 2009]
a(n+1) = 7*a(n) + 6. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 22 2009]
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CROSSREFS
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Sequence in context: A165758 A166152 A049316 this_sequence A052571 A052625 A155130
Adjacent sequences: A024072 A024073 A024074 this_sequence A024076 A024077 A024078
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KEYWORD
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nonn,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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