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 A327009 #8 Aug 12 2019 23:26:43 %S A327009 1,2,3,8,24,48,120,360,1088,3135,9999,31328,103040,342224,1151328, %T A327009 3920399,13571855,47416995,166642280,590733024,2105524995,7553695743, %U A327009 27244473480,98709700760,359212031648,1312529961648 %N A327009 Indices of records in A327007. %C A327009 a(n) = smallest m such that A327007(m) = n-1. %F A327009 For n >= 6, a(n) = A327010(n-1)^2 - 1. %Y A327009 Cf. A000196, A327007, A327008, A327010. %K A327009 nonn %O A327009 1,2 %A A327009 _Max Alekseyev_, Aug 12 2019