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Search: id:A154879
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| 3, -2, 4, 0, 8, 8, 24, 40, 88, 168, 344, 680, 1368, 2728, 5464, 10920, 21848, 43688, 87384, 174760, 349528, 699048, 1398104, 2796200, 5592408, 11184808, 22369624, 44739240, 89478488, 178956968, 357913944, 715827880, 1431655768, 2863311528, 5726623064
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OFFSET
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0,1
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COMMENT
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Second differences of A078008. First differences of the sequence (-1)^(n+1)*A084247(n).
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FORMULA
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a(n)+a(n+1)= A000079(n), n>1.
a(n+3)= 8*A001045(n) = 4*A078008(n+1) = 2*A097073(n+1).
a(n)=a(n-1)+2*a(n-2). G.f.: (3-5x)/((1+x)(1-2x)). [R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 23 2009]
a(n)=(1/3)*[8*(-1)^n+2^n], with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Mar 02 2009]
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CROSSREFS
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Cf. A115341.
Sequence in context: A127099 A004545 A127481 this_sequence A097673 A140430 A123359
Adjacent sequences: A154876 A154877 A154878 this_sequence A154880 A154881 A154882
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KEYWORD
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sign,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Jan 16 2009
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EXTENSIONS
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Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 23 2009
Corrected typo in A-number in formula R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 23 2009
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