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A016134
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Expansion of 1/((1-2x)(1-10x)).
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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; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..900
Index to sequences with linear recurrences with constant coefficients, signature (12,-20)
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FORMULA
| 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.: 1/(1-12*x+20*x^2) [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 27 2009, corrected by R. J. Mathar, Mar 14 2011
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PROG
| (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]
(MAGMA) [2^n*(5^(n+1)-1)/4: n in [0..20]]; // Vincenzo Librandi, Oct 09 2011
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CROSSREFS
| A060458 [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 05 2009]
Sequence in context: A163147 A120918 A039680 * A045507 A155595 A070312
Adjacent sequences: A016131 A016132 A016133 * A016135 A016136 A016137
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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