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 A109547 #12 May 21 2025 01:23:39 %S A109547 12,20,30,42,56,650,812,992,16256,67100672,17179738112,274877382656, %T A109547 1125625079263232,4611686016279904256 %N A109547 Admirable oblong numbers. %C A109547 a(15) <= 18889393874090701094912. - _Donovan Johnson_, Jun 20 2011 %Y A109547 Intersection of A002378 and A111592. %K A109547 nonn,more %O A109547 1,1 %A A109547 _Jason Earls_, Aug 30 2005 %E A109547 a(12)-a(13) from _Donovan Johnson_, Jul 15 2009 %E A109547 a(14) from _Donovan Johnson_, Jun 21 2011