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 A046531 #15 Apr 13 2021 19:24:51 %S A046531 1,1,3,1,5,1,11,7,1,9,9,1,20,27,11,1,67,19,13,1,147,105,51,15,1,126, %T A046531 78,33,17,1,273,204,111,83,19,1,477,315,305,51,21,1,1023,792,935,407, %U A046531 123,23,1,1815,2519,671,265,73,25,1,3861,6149,3861,936,338,171 %N A046531 Numerators of elements to right of central elements of 1/2-Pascal triangle (by row). %H A046531 Thomas M. Richardson, <a href="http://arxiv.org/abs/1609.01193">The three 'R's and Dual Riordan Arrays</a>, arXiv:1609.01193 [math.CO], 2016. %e A046531 1/1; %e A046531 1/1 1/1; --> 1 %e A046531 1/1 1/2 1/1; --> 1 %e A046531 1/1 3/2 3/2 1/1; --> 3 1 %e A046531 1/1 5/2 3/1 5/2 1/1; --> 5 1 %e A046531 1/1 7/2 11/2 11/2 7/2 1/1; --> 11 7 1 %e A046531 1/1 9/2 9/1 11/1 9/1 9/2 1/1; --> 9 9 1 %e A046531 1/1 11/2 27/2 20/1 20/1 27/2 11/2 1/1; --> 20 27 11 1 %Y A046531 Cf. A046213, A046226. %K A046531 tabf,nonn,less %O A046531 1,3 %A A046531 _Mohammad K. Azarian_ %E A046531 More terms from _Sean A. Irvine_, Apr 13 2021