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A010726
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Period 2: repeat (6,10).
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5
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6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10, 6, 10
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Contribution from Klaus Brockhaus, Dec 10 2009: (Start)
Interleaving of A010722 and A010692.
Also continued fraction expansion of 3+4*sqrt(15)/5.
Binomial transform of 6 followed by A122803 without initial terms 1,-2.
Inverse binomial transform of A171494. (End)
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (0,1).
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FORMULA
| a(n)=-2*(-1)^n+8 =10*(n mod 2)+6*[(n+1) mod 2] - Paolo P. Lava (paoloplava(AT)gmail.com), Oct 27 2006
Contribution from Klaus Brockhaus, Dec 10 2009: (Start)
a(n) = a(n-2) for n > 1; a(0) = 6, a(1) = 10.
G.f.: 2*(3+5*x)/((1-x)*(1+x)). (End)
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PROG
| (MAGMA) &cat[ [6, 10]: n in [1..42] ]; [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 10 2009]
(PARI) a(n)=6+n%2*4 \\ Charles R Greathouse IV, Dec 21 2011
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CROSSREFS
| Equals 2*A010703. Cf. A010722 (all 6's sequence), A010692 (all 10's sequence), A122803 (powers of -2), A171494. [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 10 2009]
Sequence in context: A075368 A074288 A156383 * A084365 A066135 A070393
Adjacent sequences: A010723 A010724 A010725 * A010727 A010728 A010729
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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