This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A164828 #15 Apr 08 2024 15:43:46
%S A164828 1,1,11,120,122,1331,1462,15960,17413,190081,207503,2265120,2472614,
%T A164828 26991251,29463874,321630000,351093865,3832568641,4183662515,
%U A164828 45669193800,49852856306,544197756851,594050613166,6484703888520,7078754501677,77272248905281
%N A164828 Generalized Fibonacci numbers.
%H A164828 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0,11,0,11,0,-1).
%F A164828 For n odd a(n) = 11a(n-2) + a(n-3), for n even a(n) = 11a(n-1)- a(n-3); with a(1,2) = 1 (For Fibonacci sequence: factor 2 instead of 11).
%F A164828 G.f.: x*(1+x+109*x^3-10*x^4)/((1+x^2)*(1-12*x^2+x^4)). [_Colin Barker_, Jul 27 2012]
%t A164828 LinearRecurrence[{0,11,0,11,0,-1},{1,1,11,120,122,1331},30] (* _Harvey P. Dale_, Jun 14 2014 *)
%Y A164828 Cf. A000045, A041059.
%K A164828 nonn,easy
%O A164828 1,3
%A A164828 _Mark Dols_, Aug 27 2009