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#27 by Charles R Greathouse IV at Thu Sep 08 08:44:37 EDT 2022
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Discussion
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| Thu Sep 08
| 08:44
| OEIS Server: https://oeis.org/edit/global/2944
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#26 by Charles R Greathouse IV at Sat Jul 23 02:43:32 EDT 2016
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#25 by Charles R Greathouse IV at Sat Jul 23 02:43:30 EDT 2016
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#24 by Bruno Berselli at Thu Dec 10 04:34:46 EST 2015
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#23 by Bruno Berselli at Thu Dec 10 04:34:43 EST 2015
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a(n) = 2*(1-(-1)^n). ); a(n) = 4*(n mod 2) - Paolo P. Lava, Oct 20 2006
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#22 by Bruno Berselli at Thu Dec 10 04:34:25 EST 2015
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<a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1).
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| FORMULA
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a(n) = 2*[*(1-(-1)^n]. ). a(n)=) = 4*(n mod 2) - Paolo P. Lava, Oct 20 2006
a(n) = 4*(1+floor((n+1)/2)-ceilceiling((n+1)/2)). - Wesley Ivan Hurt, May 21 2013
a(n) = 4 * *cos( Pi * (*(n+1)/2 )^2. - Wesley Ivan Hurt, May 21 2013
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(MAGMA) &cat [[0, 4]^^50]; // Bruno Berselli, Dec 10 2015
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nonn,easy
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approved
editing
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#21 by Charles R Greathouse IV at Sat Jun 13 00:48:26 EDT 2015
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<a href="/index/Rec">Index to sequencesentries withfor linear recurrences with constant coefficients</a>, signature (0,1).
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Discussion
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| Sat Jun 13
| 00:48
| OEIS Server: https://oeis.org/edit/global/2439
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#20 by Charles R Greathouse IV at Fri Jun 12 15:32:22 EDT 2015
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<a href="/index/Rec#recLCC">Index to sequences with linear recurrences with constant coefficients</a>, signature (0,1).
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Discussion
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| Fri Jun 12
| 15:32
| OEIS Server: https://oeis.org/edit/global/2437
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#19 by T. D. Noe at Tue May 21 14:51:25 EDT 2013
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#18 by T. D. Noe at Tue May 21 14:51:21 EDT 2013
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a(n)=) = 2*[1-(-1)^n]. a(n)=4*(n mod 2) - Paolo P. Lava, Oct 20 2006
O.g.f.: -2/(1+x)-2/(x-1) . - ). - _R. J. Mathar, _, Feb 19 2008
a(n) = 4*(1+floor((n+1)/2)-ceil((n+1)/2)). - )). - _Wesley Ivan Hurt, _, May 21 2013
a(n) = 4 * cos( Pi * (n+1)/2 )^2. - . - _Wesley Ivan Hurt, _, May 21 2013
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proposed
editing
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