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 A046215 #11 Jun 22 2013 16:05:38 %S A046215 2,3,2,3,2,5,2,3,5,2,7,2,11,2,11,2,7,2,9,2,9,11,9,9,2,11,2,27,2,20,20, %T A046215 27,2,11,2,13,2,19,67,2,40,67,2,19,13,2,15,2,51,2,105,2,147,2,147,2, %U A046215 105,2,51,2,15,2,17,2,33,78,126,147,126,78,33,17,2,19,2,83,2,111,204 %N A046215 First numerator and then denominator of 1/2-Pascal triangle (by row), excluding 1's. %e A046215 1/1; --> %e A046215 1/1 1/1; --> %e A046215 1/1 1/2 1/1; --> 2 %e A046215 1/1 3/2 3/2 1/1; --> 3 2 3 2 %e A046215 1/1 5/2 3/1 5/2 1/1; --> ... %e A046215 1/1 7/2 11/2 11/2 7/2 1/1; %e A046215 1/1 9/2 9/1 11/1 9/1 9/2 1/1; %e A046215 1/1 11/2 27/2 20/1 20/1 27/2 11/2 1/1; ... %Y A046215 Cf. A046213. %K A046215 tabf,nonn,frac,less %O A046215 1,1 %A A046215 _Mohammad K. Azarian_ %E A046215 More terms from Larry Reeves (larryr(AT)acm.org), Apr 06 2000