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 A046230 #9 Jul 02 2025 16:01:57 %S A046230 1,1,1,1,3,1,1,5,1,1,11,7,1,1,1,9,9,1,1,1,20,27,11,1,1,67,1,19,13,1,1, %T A046230 147,105,51,15,1,1,1,126,1,78,1,33,17,1,1,1,273,1,204,1,111,83,19,1,1, %U A046230 1,477,1,315,305,1,51,21,1,1,1,1023,1,792,935,407,123,23,1,1,1,1815 %N A046230 First denominator and then numerator of elements to right of central elements of 1/2-Pascal triangle (by row), excluding 2's. %e A046230 1/1; 1/1 1/1; 1/1 1/2 1/1; 1/1 3/2 3/2 1/1; 1/1 5/2 3/1 5/2 1/1; 1/1 7/2 11/2 11/2 7/2 1/1; 1/1 9/2 9/1 11/1 9/1 9/2 1/1; 1/1 11/2 27/2 20/1 20/1 27/2 11/2 1/1; ... %Y A046230 Cf. A046213. %K A046230 tabf,nonn %O A046230 1,5 %A A046230 _Mohammad K. Azarian_ %E A046230 More terms from _James Sellers_, Dec 13 1999