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 A083789 #13 Jul 14 2015 04:27:37 %S A083789 1,2,6,9,12,28,30,1811,1976,8384,53760,243875,639336,41381633, %T A083789 102621357,7802708751,7802708752,178874468632,1133934949386 %N A083789 Diagonal of A083788. %C A083789 a(16) > 750000000. - _Ray Chandler_, Aug 21 2003 %C A083789 a(18) > 10^11. [_Donovan Johnson_, Oct 24 2009] %C A083789 a(20) > 10^13. - _Giovanni Resta_, Jul 13 2015 %Y A083789 Cf. A083788, A083790, A083791. %K A083789 nonn,more %O A083789 1,2 %A A083789 _Amarnath Murthy_, May 07 2003 %E A083789 Corrected and extended by _Ray Chandler_, Aug 17 2003 %E A083789 More terms from _Ray Chandler_, Aug 21 2003 %E A083789 a(16)-a(17) from _Donovan Johnson_, Oct 24 2009 %E A083789 a(18)-a(19) from _Giovanni Resta_, Jul 13 2015