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 A198943 #22 Mar 20 2023 03:45:04
%S A198943 1,9,41,79,351,1559,3001,13329,59201,113959,506151,2248079,4327441,
%T A198943 19220409,85367801,164328799,729869391,3241728359,6240166921,
%U A198943 27715816449,123100309841,236962014199,1052471155671,4674570045599,8998316372641,39966188099049,177510561422921
%N A198943 y-values in the solution to 10*x^2-9 = y^2.
%H A198943 Vincenzo Librandi, <a href="/A198943/b198943.txt">Table of n, a(n) for n = 1..250</a>
%H A198943 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,38,0,0,-1).
%F A198943 a(n+6) = 38*a(n+3)-a(n) with a(1)=1, a(2)=9, a(3)=41, a(4)=79, a(5)=351.
%F A198943 G.f.: x*(1+x)*(1+8*x+33*x^2+8*x^3+x^4)/(1-38*x^3+x^6). - _Bruno Berselli_, Nov 04 2011
%t A198943 LinearRecurrence[{0,0, 38, 0,0, -1}, {1, 9, 41, 79, 351, 1559}, 27] (* _Bruno Berselli_, Nov 11 2011 *)
%Y A198943 Cf. A052454.
%K A198943 nonn,easy
%O A198943 1,2
%A A198943 _Sture Sjöstedt_, Oct 31 2011
%E A198943 More terms from _Bruno Berselli_, Nov 04 2011