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 A046578 #11 Jun 22 2013 16:05:40 %S A046578 5,9,19,13,8,17,2,35,49,21,119,2,35,25,259,189,95,29,112,71,31,33,2, %T A046578 483,183,102,157,37,2,849,285,565,2,97,41,2,1815,2,1419,1705,759,235, %U A046578 45,1617,4543,616,2,497,70,49,3432,11011,7007,2,1729,2,637,329,53,24739,2,9009 %N A046578 First denominator and then numerator of the elements to the right of the central elements of the 1/4-Pascal triangle (by row), excluding 1's and 4's. %e A046578 1/1; --> %e A046578 1/1 1/1; --> %e A046578 1/1 1/4 1/1; --> %e A046578 1/1 5/4 5/4 1/1; --> 5 %e A046578 1/1 9/4 5/2 9/4 1/1; --> 9 %e A046578 1/1 13/4 19/4 19/4 13/4 1/1; --> ... %e A046578 1/1 17/4 8/1 19/2 8/1 17/4 1/1; %e A046578 1/1 21/4 49/4 35/2 35/2 49/4 21/4 1/1; ... %Y A046578 Cf. A046563. %K A046578 tabf,nonn,frac,less %O A046578 1,1 %A A046578 _Mohammad K. Azarian_ %E A046578 More terms from _David W. Wilson_