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Search: id:A109241
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| A109241 |
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Expansion of 1/((1-10x)(1-100x)). |
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+0
5
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| 1, 110, 11100, 1111000, 111110000, 11111100000, 1111111000000, 111111110000000, 11111111100000000, 1111111111000000000, 111111111110000000000, 11111111111100000000000
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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a(n) has n+1 1's and n 0's. Partial sums are A109242.
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FORMULA
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a(n)=10^(2n+1)/9-10^n/9.
a(n)= A006516(n+1) written in base 2. - Omar E. Pol (info(AT)polprimos.com), Feb 24 2008
a(n)= A138147(n+1)/10. [From Omar E. Pol (info(AT)polprimos.com), Nov 08 2008]
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MAPLE
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g:=(1-z)/((1-z)*(1-10*z)* (1-100*z)): gser:=series(g, z=0, 43): seq(coeff(gser, z, n), n=0..14); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 13 2009]
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CROSSREFS
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Cf. A006516.
Cf. A138147. [From Omar E. Pol (info(AT)polprimos.com), Nov 08 2008]
Sequence in context: A163664 A135645 A058935 this_sequence A090490 A135650 A097580
Adjacent sequences: A109238 A109239 A109240 this_sequence A109242 A109243 A109244
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jun 23 2005
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