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 A285204 #4 May 03 2017 13:43:31 %S A285204 1,3,5,5,7,5,7,5,7,5,9,5,7,5,7,5,9,5,7,5,7,5,9,5,7,5,7,5,9,5,7,5,7,5, %T A285204 11,5,7,5,7,5,9,5,7,5,7,5,9,5,7,5,7,5,9,5,7,5,7,5,11,5,7,5,7,5,9,5,7, %U A285204 5,7,5,9,5,7,5,7,5,9,5,7,5,7,5,11,5,7,5,7,5,9,5,7 %N A285204 Row lengths of triangle A285202. %F A285204 a(n) = 2*A285203(n)-1 for n>0. %Y A285204 Cf. A285200-A285203. %K A285204 nonn %O A285204 0,2 %A A285204 _N. J. A. Sloane_, May 03 2017