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 A046564 #10 Jun 22 2013 16:05:39 %S A046564 1,1,1,1,1,1,1,1,4,1,1,1,1,1,4,5,4,5,1,1,1,1,4,9,2,5,4,9,1,1,1,1,4,13, %T A046564 4,19,4,19,4,13,1,1,1,1,4,17,1,8,2,19,1,8,4,17,1,1,1,1,4,21,4,49,2,35, %U A046564 2,35,4,49,4,21,1,1,1,1,4,25,2,35,4,119,1,35,4,119,2,35,4,25,1,1,1,1,4 %N A046564 First denominator and then numerator of each element of the 1/4-Pascal triangle (by row). %e A046564 1/1; --> 1 1 %e A046564 1/1 1/1; --> 1 1 1 1 %e A046564 1/1 1/4 1/1; --> 1 1 4 1 1 1 %e A046564 1/1 5/4 5/4 1/1; --> ... %e A046564 1/1 9/4 5/2 9/4 1/1; %e A046564 1/1 13/4 19/4 19/4 13/4 1/1; %e A046564 1/1 17/4 8/1 19/2 8/1 17/4 1/1; %e A046564 1/1 21/4 49/4 35/2 35/2 49/4 21/4 1/1; ... %Y A046564 Cf. A046563. %K A046564 tabf,nonn,frac,less %O A046564 1,9 %A A046564 _Mohammad K. Azarian_