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 A105828 #7 Jun 17 2018 19:00:35 %S A105828 1,3,4,7,2,5,12,9,21,8,13,6,19,11,30,41,15,26,24,50,14,36,18,10,28,38, %T A105828 66,20,16,48,45,93,72,165,63,102,96,198,105,23,62,85,58,27,31,46,32, %U A105828 78,47,43,90,117,22,95,53,42,128,40,25,65,68,124,79,129,208,100,108,184,64 %N A105828 For n>2, a(n) not appeared previously is such that a(n-1)^2+4*a(n-2)*a(n) is a minimal square, a(1)=1, a(2)=3. %H A105828 Ivan Neretin, <a href="/A105828/b105828.txt">Table of n, a(n) for n = 1..10000</a> %Y A105828 Cf. A105822, A105829-A105836. %K A105828 nonn,look %O A105828 1,2 %A A105828 _Zak Seidov_, Apr 22 2005