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 A165741 #8 Jan 21 2020 00:14:29 %S A165741 1,2,4,7,8,11,13,14,16,19,22,23,26,28,29,32,37,38,41,43,44,46,47,49, %T A165741 52,53,56,58,59,61,64,67,71,73,74,76,77,79,82,83,86,88,89,91,92,94,97, %U A165741 98,101,103,104,106,107,109,112,113,116,118,121,122,128,131,133,134,137 %N A165741 Positive integers n such that the toric n X n "Lights Out" puzzle has a unique solution (up to the order of flippings; each flipping appears at most once). %C A165741 Complement to the sequence A165740 in the set of positive integers. %D A165741 See A165738 for the references. %H A165741 Max Alekseyev and Thomas Buchholz, <a href="/A165741/b165741.txt">Table of n, a(n) for n = 1..1000</a> [terms 66 through 1000 were computed by Thomas Buchholz, May 20 2014] %F A165741 n is in this sequence iff A165738(n)=0. %Y A165741 Cf. A159257, A075462, A076436, A165740. %K A165741 nonn %O A165741 1,2 %A A165741 _Max Alekseyev_, Sep 25 2009 %E A165741 More terms from _Thomas Buchholz_, May 20 2014