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Search: id:A016134
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| A016134 |
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Expansion of 1/((1-2x)(1-10x)). |
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+0
5
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| 1, 12, 124, 1248, 12496, 124992, 1249984, 12499968, 124999936, 1249999872, 12499999744, 124999999488, 1249999998976, 12499999997952, 124999999995904, 1249999999991808, 12499999999983616, 124999999999967232
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) =125*10^(n-2)-2^(n-2) =a(n-1)*10+2^n - Henry Bottomley (se16(AT)btinternet.com), Jun 06 2000
G.f.: x/(1-12*x+20*x^2) [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 27 2009]
a(n) = (10^n - 2^n)/8 , n>=1 . [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 05 2009]
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PROGRAM
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(Other) sage: [lucas_number1(n, 12, 20) for n in xrange(1, 18)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 27 2009]
(Other) sage: [(10^n - 2^n)/8 for n in xrange(1, 19)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 05 2009]
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CROSSREFS
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A060458 [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 05 2009]
Sequence in context: A163147 A120918 A039680 this_sequence A045507 A155595 A070312
Adjacent sequences: A016131 A016132 A016133 this_sequence A016135 A016136 A016137
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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