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A013740
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a(n) = 7^(3*n + 1).
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2
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7, 2401, 823543, 282475249, 96889010407, 33232930569601, 11398895185373143, 3909821048582988049, 1341068619663964900807, 459986536544739960976801, 157775382034845806615042743, 54116956037952111668959660849
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 343*a(n-1); a(0)=7.
G.f.: 7/(1-343*x). (End)
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MAPLE
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MATHEMATICA
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7^(3*Range[0, 20]+1) (* or *) NestList[343#&, 7, 20] (* Harvey P. Dale, Jan 21 2012 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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