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 A171864 #9 Sep 12 2019 15:00:31 %S A171864 1,3,5,20,66,148,173,324,471,539,548,621,670,1486,2109,2693,3735,7574, %T A171864 7619,7886,13191,15116,24862,27717,29981,31679,45110,59597,60876, %U A171864 65607,78847,82959,96998,102840,199861,293758,368318,371583,382472,440644,523875,841338 %N A171864 Positions in A181391 where the terms listed in A171863 appear. %C A171864 Records in A171862 (values). %H A171864 Benjamin Chaffin, <a href="/A171864/b171864.txt">Table of n, a(n) for n = 1..215</a> %Y A171864 Cf. A181391, A171862, A171863. %K A171864 nonn %O A171864 1,2 %A A171864 _N. J. A. Sloane_, Oct 17 2010 %E A171864 a(34) onwards from _Benjamin Chaffin_, Sep 11 2019