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Search: id:A084215
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| 1, 2, 5, 10, 20, 40, 80, 160, 320, 640, 1280, 2560, 5120, 10240, 20480, 40960, 81920, 163840, 327680, 655360, 1310720, 2621440, 5242880, 10485760, 20971520, 41943040, 83886080, 167772160, 335544320, 671088640, 1342177280, 2684354560
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Associated with a math magic problem.
Elements are the sums of consecutive pairs of elements of A084214.
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LINKS
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Index entries for sequences related to linear recurrences with constant coefficients
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FORMULA
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a(n)=sum{k=0..n, 2^(n-k)binomial(1, k/2)(1+(-1)^k)/2} - Paul Barry (pbarry(AT)wit.ie), Oct 15 2004
a(n)=A020714(n-2), n>1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 19 2008]
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MAPLE
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with(finance):seq(floor(futurevalue(10, 1, n)), n=-3..28); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 24 2009]
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CROSSREFS
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Cf. A060816.
Sequence in context: A001629 A159230 A068034 this_sequence A024810 A049938 A002460
Adjacent sequences: A084212 A084213 A084214 this_sequence A084216 A084217 A084218
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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), May 19 2003
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