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 A274617 #9 Jul 02 2016 22:05:52 %S A274617 6,1,2,5,4,7,3,9,10,11,12,8,14,13,16,17,18,19,15,21,20,23,22,25,26,27, %T A274617 28,24,30,29,32,33,34,35,31,37,36,39,38,41,42,43,44,40,46,45,48,49,50, %U A274617 51,47,53,52,55,54,57,58,59,60,56,62,61,64,65,66,67,63,69,68,71,70,73,74,75,76,72,78,77,80 %N A274617 Fourth column of A269526. %Y A274617 Cf. A269526. Subtracting 1 gives A274619. %K A274617 nonn %O A274617 1,1 %A A274617 _N. J. A. Sloane_, Jul 01 2016