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 A004279 #19 Oct 24 2023 21:07:55 %S A004279 1,2,3,4,5,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44, %T A004279 46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90, %U A004279 92,94,96,98,100,102,104 %N A004279 1, 3, 5 and the positive even numbers. %H A004279 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A004279 G.f.: (x^2+1)*(x^4-x^2+1)/(x-1)^2. %t A004279 Sort[Join[Range[2,104,2],Range[1,5,2]]] (* _Harvey P. Dale_, Aug 28 2011 *) %Y A004279 Cf. A004272. %K A004279 easy,nonn %O A004279 0,2 %A A004279 _N. J. A. Sloane_