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 A176430 #2 Mar 30 2012 18:40:08 %S A176430 3,21,903,1631721,5325028475403,56711856527710922180500221, %T A176430 82753323662259982099234097722219590008756576353188748920925694383267934319786203404455994065868822592721 %N A176430 Integers equal to sqrt(A174864/4). %C A176430 a(n) is divisible by 3. %C A176430 a(n+1)/a(n)= A000058(n) [From _Giovanni Teofilatto_, Apr 18 2010] %Y A176430 Cf. A174864, A176349. %K A176430 nonn %O A176430 1,1 %A A176430 _Giovanni Teofilatto_, Apr 17 2010