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 A157427 #12 Feb 16 2025 08:33:09
%S A157427 14,14,20,44,39,45,21,34,50,75,21,77,44,54,39,65,90,74,45,69,34,84,56,
%T A157427 76,50,84,111,33,119,105,69,75,95,152,14,20,55,74,110,33,153,140,14,
%U A157427 35,56,132,174,20,35,90
%N A157427 Lower left-hand y-coordinates of invisible 1x1 squares with 0 < y < x.
%H A157427 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/VisiblePoint.html">Visible Point</a>
%e A157427 {20, 14}, {35, 14}, {35, 20}, {54, 44}, {65, 39}, {69, 45}, {77, 21}, {84, 34}, {84, 50}, {95, 75}, ...
%Y A157427 Cf. A157426, A157428, A157429.
%Y A157427 Cf. A325602, A325603, A325604, A325605, A325606, A325607.
%K A157427 nonn
%O A157427 1,1
%A A157427 _Eric W. Weisstein_, Mar 01 2009