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4, 364, 3964, 39964, 399964, 3999964, 39999964, 399999964, 3999999964, 39999999964, 399999999964, 3999999999964, 39999999999964, 399999999999964, 3999999999999964, 39999999999999964, 399999999999999964
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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FORMULA
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G.f. 4*x*(1+80*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011
a(n) = 4*A170955(n). - R. J. Mathar, Aug 24 2011
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MATHEMATICA
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LinearRecurrence[{11, -10}, {4, 364}, 30] (* or *) Join[{4}, Table[ 100*FromDigits[PadRight[{3}, n, 9]]+64, {n, 30}]] (* Harvey P. Dale, Jul 31 2017 *)
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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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