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 A046581 #10 Jun 22 2013 16:05:40 %S A046581 1,1,1,1,1,1,1,1,1,1,1,1,1,5,5,1,1,1,1,9,5,2,9,1,1,1,1,13,19,19,13,1, %T A046581 1,1,1,17,8,1,19,2,8,1,17,1,1,1,1,21,49,35,2,35,2,49,21,1,1,1,1,25,35, %U A046581 2,119,35,1,119,35,2,25,1,1,1,1,29 %N A046581 First numerator and then denominator of each element of the 1/4-Pascal triangle (by row), excluding 4's. %e A046581 1/1; --> 1 1 %e A046581 1/1 1/1; --> 1 1 1 1 %e A046581 1/1 1/4 1/1; --> 1 1 1 1 1 %e A046581 1/1 5/4 5/4 1/1; --> 1 1 5 5 1 1 %e A046581 1/1 9/4 5/2 9/4 1/1; --> ... %e A046581 1/1 13/4 19/4 19/4 13/4 1/1; %e A046581 1/1 17/4 8/1 19/2 8/1 17/4 1/1; %e A046581 1/1 21/4 49/4 35/2 35/2 49/4 21/4 1/1; ... %Y A046581 Cf. A046563. %K A046581 tabf,nonn,frac,less %O A046581 1,14 %A A046581 _Mohammad K. Azarian_