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 A046217 #10 Jul 02 2025 16:01:56 %S A046217 3,3,5,3,5,7,11,11,7,9,9,11,9,9,11,27,20,20,27,11,13,19,67,40,67,19, %T A046217 13,15,51,105,147,147,105,51,15,17,33,78,126,147,126,78,33,17,19,83, %U A046217 111,204,273,273,204,111,83,19,21,51,305,315,477,546,477,315,305,51,21,23 %N A046217 First numerator and then denominator of 1/2-Pascal triangle (by row) excluding 1's and 2's. %e A046217 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 A046217 Cf. A046213. %K A046217 tabf,nonn,easy %O A046217 1,1 %A A046217 _Mohammad K. Azarian_ %E A046217 More terms from _James Sellers_, Dec 13 1999