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 A154474 #4 Jun 02 2025 01:17:57 %S A154474 1101001010,10101101010010,11001110010010,1011011100100010, %T A154474 1110111001000010,1101110010001110111001000100, %U A154474 10111001001101110010011101110010001000 %N A154474 a(n) = A007088(A154473(n)). %C A154474 This sequence gives the parenthesis expressions shown at the upper right corner image of the page 103 of NKS, with left brackets (black squares) converted to 1's and right brackets (white squares) converted to 0's. Compare to A080070, A122242, A122245. %H A154474 S. Wolfram, <a href="http://www.wolframscience.com/nksonline/page-102">A New Kind of Science, Wolfram Media Inc., (2002), p. 102</a>, <a href="http://www.wolframscience.com/nksonline/page-103">p. 103</a> and pages 104, 896-898. %K A154474 nonn,base %O A154474 0,1 %A A154474 _Antti Karttunen_, Jan 11 2009