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 A143679 #15 Aug 08 2019 06:41:56 %S A143679 1,1,1,1,8,1,1,15,15,1,1,22,78,22,1,1,29,190,190,29,1,1,36,351,848, %T A143679 351,36,1,1,43,561,2339,2339,561,43,1,1,50,820,5006,9766,5006,820,50, %U A143679 1,1,57,1128,9192,28806,28806,9192,1128,57,1 %N A143679 Duplicate of A081581. %C A143679 Is this the same as A081581? [From _R. J. Mathar_, Sep 05 2008] %C A143679 From Riordan array definition, same as A081581. - _Ralf Stephan_, Jan 03 2014 %K A143679 dead %O A143679 0,5 %A A143679 _Paul Barry_, Aug 28 2008