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 A046228 #9 Jul 02 2025 16:01:57 %S A046228 3,5,11,7,9,9,20,27,11,67,19,13,147,105,51,15,126,78,33,17,273,204, %T A046228 111,83,19,477,315,305,51,21,1023,792,935,407,123,23,1815,2519,671, %U A046228 265,73,25,3861,6149,3861,936,338,171,27,13871,5005,5733,1274,847,99,29,29315 %N A046228 First numerator and then denominator of elements to right of central elements of 1/2-Pascal triangle (by row), excluding 1's and 2's. %e A046228 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 A046228 Cf. A046213. %K A046228 tabf,nonn %O A046228 1,1 %A A046228 _Mohammad K. Azarian_ %E A046228 More terms from _James Sellers_, Dec 13 1999