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 A026410 #8 Sep 27 2019 02:50:48 %S A026410 1,2,3,5,7,8,11,13,16,20,24,29,32,37,38,46,50,59,61,68,76,78,91,92, %T A026410 105,111,112,126,136,146,159,161,164,187,203,204,219,220,237,255,257, %U A026410 275,284,304,323,326,354,359,360,391,406,408,449,451,478,493,495,499,544,545,548,588 %N A026410 a(n) = position of the first n in A026409. %K A026410 nonn %O A026410 1,2 %A A026410 _Clark Kimberling_ %E A026410 Corrected and extended by _Sean A. Irvine_, Sep 26 2019