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 A046563 #16 Mar 31 2017 22:34:51 %S A046563 1,1,1,1,1,1,1,1,1,4,1,1,1,1,5,4,5,4,1,1,1,1,9,4,5,2,9,4,1,1,1,1,13,4, %T A046563 19,4,19,4,13,4,1,1,1,1,17,4,8,1,19,2,8,1,17,4,1,1,1,1,21,4,49,4,35,2, %U A046563 35,2,49,4,21,4,1,1,1,1,25,4,35,2,119,4,35,1,119,4,35,2,25,4,1,1,1,1 %N A046563 First numerator and then denominator of each element of the 1/4-Pascal triangle (by row). To get a 1/4-Pascal triangle, replace "2" in the third row of the Pascal triangle with "1/4" and calculate all other rows as in the Pascal triangle. %e A046563 1/1; %e A046563 1/1 1/1; %e A046563 1/1 1/4 1/1; %e A046563 1/1 5/4 5/4 1/1; %e A046563 1/1 9/4 5/2 9/4 1/1; %e A046563 1/1 13/4 19/4 19/4 13/4 1/1; %e A046563 1/1 17/4 8/1 19/2 8/1 17/4 1/1; %e A046563 1/1 21/4 49/4 35/2 35/2 49/4 21/4 1/1; ... %K A046563 tabf,nonn,less %O A046563 1,10 %A A046563 _Mohammad K. Azarian_