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 A171897 #10 Jun 15 2019 21:48:32 %S A171897 0,1,2,6,5,4,3,9,14,15,17,11,8,42,20,32,18,7,31,33,56,19,37,46,23,21, %T A171897 25,52,13,62,40,36,16,27,10,92,51,131,39,12,44,34,97,82,43,98,152,170, %U A171897 24,29,45,84,70,58,144,94,78,26,38,76,166,111,145,206,194 %N A171897 Numbers in the van Eck sequence A181391 in order of first appearance. %H A171897 N. J. A. Sloane, <a href="/A171897/b171897.txt">Table of n, a(n) for n = 1..1702</a> %Y A171897 Cf. A181391. %K A171897 nonn %O A171897 1,3 %A A171897 _N. J. A. Sloane_, Oct 19 2010