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Search: id:A131885
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| A131885 |
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a(n) = 4a(n-1)-6a(n-2)+4a(n-3), n > 3; a(0) = 1, a(1) = 2, a(2) = 4, a(3) = 6. |
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+0
1
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| 1, 2, 4, 6, 8, 12, 24, 56, 128, 272, 544, 1056, 2048, 4032, 8064, 16256, 32768
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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Binomial transform of 1, 1, 1, -1.
G.f.: (-1+2*x-2*x^2+2*x^3)/(2*x-1)/(2*x^2-2*x+1). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007
a(n)=2*A038504(n), n>0. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 17 2009]
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CROSSREFS
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Sequence in context: A164145 A140999 A001217 this_sequence A087443 A036035 A063008
Adjacent sequences: A131882 A131883 A131884 this_sequence A131886 A131887 A131888
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Oct 25 2007
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