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 A105837 #15 Jun 13 2015 00:51:47
%S A105837 1,131,529,52139,210541,20751191,83794789,8258921879,33350115481,
%T A105837 3287030156651,13273262166649,1308229743425219,5282724992210821,
%U A105837 520672150853080511,2102511273637740109,207226207809782618159,836794204182828352561
%N A105837 Numbers n such that n^2 = 11*m^2 + 11*m + 1.
%H A105837 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,398,0,-1).
%F A105837 a(1)=1, a(2)=131, a(3)=398*a(1)+a(2), a(4)=398*a(2)+a(1), a(n)=398*a(n-2)-a(n-4) for n>4.
%F A105837 G.f.: x*(1+x)*(1+130*x+x^2)/((1-20*x+x^2)*(1+20*x+x^2)). [_Bruno Berselli_, Feb 21 2013]
%t A105837 LinearRecurrence[{0, 398, 0, -1}, {1, 131, 529, 52139}, 17]
%Y A105837 Cf. A105838 (associated m).
%K A105837 nonn,easy
%O A105837 1,2
%A A105837 _Pierre CAMI_, Apr 22 2005
%E A105837 More terms from _Bruno Berselli_, Feb 21 2013