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 A046576 #9 Jul 02 2025 16:01:57 %S A046576 1,1,1,1,4,5,1,1,4,9,1,1,4,19,4,13,1,1,1,8,4,17,1,1,2,35,4,49,4,21,1, %T A046576 1,4,119,2,35,4,25,1,1,4,259,4,189,4,95,4,29,1,1,1,112,1,71,1,31,4,33, %U A046576 1,1,2,483,1,183,1,102,4,157,4,37,1,1,2,849,1,285,4,565,2,97,4,41,1,1,2 %N A046576 First denominator and then numerator of the elements to the right of the central elements of the 1/4-Pascal triangle. %e A046576 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 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 35/2 49/4 21/4 1/1; ... %Y A046576 Cf. A046563. %K A046576 nonn %O A046576 1,5 %A A046576 _Mohammad K. Azarian_ %E A046576 More terms from _James Sellers_, Dec 14 1999