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a(n) = 6*11^n + 1.
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(MAGMAMagma) [6*11^n+1: n in [0..30]];
<a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (12,-11).
<a href="/index/Rec">Index to sequences with entries for linear recurrences with constant coefficients</a>, signature (12,-11).
<a href="/index/Rec#recLCC">Index to sequences with linear recurrences with constant coefficients</a>, signature (12,-11).
<a href="/Sindx_Rea.htmlindex/Rec#recLCC">Index to sequences with linear recurrences with constant coefficients</a>, signature (12,-11).
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6*11^Range[0, 20]+1 (* or *) LinearRecurrence[{12, -11}, {7, 67}, 20] (* Harvey P. Dale, Jul 16 2014 *)
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_Vincenzo Librandi (vincenzo.librandi(AT)tin.it), _, Nov 10 2011