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A135403
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a(n) = 1 + 111110*n.
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1
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1, 111111, 222221, 333331, 444441, 555551, 666661, 777771, 888881, 999991, 1111101, 1222211, 1333321, 1444431, 1555541, 1666651, 1777761, 1888871, 1999981, 2111091, 2222201, 2333311, 2444421, 2555531, 2666641, 2777751, 2888861, 2999971, 3111081, 3222191
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: (1 + 111109*x)/(1 - x)^2.
E.g.f.: (1 + 111110*x)*exp(x).
a(n) = 2*a(n-1) - a(n-2). (End)
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MATHEMATICA
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LinearRecurrence[{2, -1}, {1, 111111}, 25] (* G. C. Greubel, Oct 12 2016 *)
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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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Dohong Kim 20710847 (upossss(AT)naver.com), Dec 11 2007
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EXTENSIONS
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a(12) and a(13) corrected by T. D. Noe, Mar 14 2008
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STATUS
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approved
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