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 A308175 #17 May 22 2019 13:17:54 %S A308175 2,1,4,1,5,4,8,4,7,2,8,12,2,13,10,17,7,3,8,19,14,3,15,21,19,24,18,28, %T A308175 17,25,27,19,34,9,23,7,38,21,32,20,38,14,30,34,29,45,24,39,35,4,36,41, %U A308175 27,49,33,54,36,52,41,4,42,54,39,31,65,24,44,9,36,53 %N A308175 Let EM denote the Ehrenfeucht-Mycielski sequence A038219, and let P(n) = [EM(1),...,EM(n)]. To compute EM(n+1) for n>=3, we find the longest suffix S (say) of P(n) which has previously appeared in P(n). Suppose the most recent appearance of S began at index n-t(n). Then a(n) = t(n), while the length of S is given in A308174. %C A308175 Then EM(n+1) is the complement of the bit following the most recent appearance of S. %H A308175 Rémy Sigrist, <a href="/A308175/b308175.txt">Table of n, a(n) for n = 3..50000</a> %H A308175 Rémy Sigrist, <a href="/A308175/a308175.pl.txt">Perl program for A308175</a> %e A308175 Tableau showing calculation of terms 3 through 13 %e A308175 1 2 3 4 5 6 7 8 9 10 11 12 13 n %e A308175 0 1 0 0 1 1 0 1 0 1 1 1 0 A038219(n) %e A308175 - - 0 0 01 1 10 01 010 101 011 11 110 S %e A308175 - - 1 1 2 1 2 2 3 3 3 2 3 s = A308174(n) %e A308175 - - 1 3 1 5 2 4 1 6 4 10 5 previous %e A308175 - - 2 1 4 1 5 4 8 4 7 2 8 t = A308175(n) %e A308175 "Previous" = index of start of most recent previous occurrence of S; s = |S|; t = n - "previous" = A308175(n) %o A308175 (Perl) See Links section. %Y A308175 Cf. A038219, A308174. %K A308175 nonn,look %O A308175 3,1 %A A308175 _N. J. A. Sloane_, May 21 2019, corrected and extended May 21 2019 %E A308175 More terms from _Rémy Sigrist_, May 21 2019