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A084183
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Jacobsthal reverse-pair sequence.
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5
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0, 1, 1, 5, 3, 21, 11, 85, 43, 341, 171, 1365, 683, 5461, 2731, 21845, 10923, 87381, 43691, 349525, 174763, 1398101, 699051, 5592405, 2796203, 22369621, 11184811, 89478485, 44739243, 357913941, 178956971, 1431655765, 715827883, 5726623061
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| Reverses elements a(2n+1) and a(2n+2) in A001045.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..1000
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FORMULA
| G.f.: x(1+2x+2x^2)/((1+x)(1+2x)(1-2x))
a(n)=(5*2^n-6*0^n+4(-1)^n-3(-2)^n)/12 - Paul Barry (pbarry(AT)wit.ie), May 19 2003
a(n) - 2*a(n-1) is a signed version of A000225. - Paul Curtz (bpcrtz(AT)free.fr), Mar 06 2008
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PROG
| (MAGMA) [(5*2^n-6*0^n+4*(-1)^n-3*(-2)^n)/12: n in [0..40]]; // Vincenzo Librandi, Aug 13 2011
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CROSSREFS
| Sequence in context: A061037 A070262 A171621 * A099730 A072800 A199637
Adjacent sequences: A084180 A084181 A084182 * A084184 A084185 A084186
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), May 19 2003
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