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 A361999 #8 Apr 05 2023 13:31:13 %S A361999 2,1,-1,0,8,24,33,90,116,25,402,140,85,120,692,91,472,1240,369,762, %T A361999 694,551,3290,322,121,2758,1164,321,778,3144,663,3418,4684,721,8590, %U A361999 3222,511,7424,5202,391,3364,10392,531,9710,1714,891,27116,11008,703,19132,8898 %N A361999 a(n) is the smallest k such that A361902(k) = n, or -1 if no such k exists. %H A361999 Pontus von Brömssen, <a href="/A361999/b361999.txt">Table of n, a(n) for n = 0..500</a> %Y A361999 Cf. A260350, A361902. %K A361999 sign %O A361999 0,1 %A A361999 _Pontus von Brömssen_, Apr 02 2023