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Search: id:A166920
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| A166920 |
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Companion of baguenaudier A051049. a(n)= (A000225(n+1)=1,3,7,15,31,63) - (A051049=1,1,4,7,16,31). |
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+0
4
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| 0, 2, 3, 8, 15, 32, 63, 128, 255, 512, 1023, 2048
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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First differences: A014551 (Jacobsthal-Lucas) . Inverse binomial transform: 0,A014551 signed = 0,2,-1,5,-7,17,. Main diagonal: A131577.
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FORMULA
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From a(0)=0, a(n+1)-2a(n)=period 2:repeat 2,-1. a(n)= (A014551=2,1,5,7,17,31) + period 2:repeat -2,1.
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CROSSREFS
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Sequence in context: A099920 A128022 A011946 this_sequence A080206 A132862 A055543
Adjacent sequences: A166917 A166918 A166919 this_sequence A166921 A166922 A166923
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KEYWORD
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nonn,uned
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Oct 23 2009
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