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Search: id:A016130
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| A016130 |
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Expansion of 1/((1-2x)(1-7x)). |
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+0
9
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| 1, 9, 67, 477, 3355, 23517, 164683, 1152909, 8070619, 56494845, 395464939, 2768256621, 19377800443, 135644611293, 949512295435, 6646586100813, 46526102771227, 325682719529661, 2279779036969771
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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(7^(n+1) - 2^(n+1))/5 - Lambert Klasen (lambert.klasen(AT)gmx.net), Feb 06 2005
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EXAMPLE
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1/((1-2x)(1-7x)) = 1 + 9*x + 67*x^2 + 477*x^3 + 3355*x^4 + 23517*x^5 + 164683*x^6 + ...
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PROGRAM
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(Other) sage: [lucas_number1(n, 9, 14) for n in xrange(1, 20)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 23 2009]
(Other) sage: [(7^n - 2^n)/5 for n in xrange(1, 20)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 04 2009]
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CROSSREFS
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Sequence in context: A106132 A105287 A163349 this_sequence A115202 A155592 A002051
Adjacent sequences: A016127 A016128 A016129 this_sequence A016131 A016132 A016133
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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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