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 A046580 #17 Apr 14 2021 03:52:10 %S A046580 1,1,5,1,9,1,19,13,1,8,17,1,35,49,21,1,119,35,25,1,259,189,95,29,1, %T A046580 112,71,31,33,1,483,183,102,157,37,1,849,285,565,97,41,1,1815,1419, %U A046580 1705,759,235,45,1,1617,4543,616,497,70,49,1,3432,11011,7007,1729,637 %N A046580 Numerators of the elements to the right of the central elements of the 1/4-Pascal triangle (by row). %e A046580 1/1; --> %e A046580 1/1 1/1; --> 1 %e A046580 1/1 1/4 1/1; --> 1 %e A046580 1/1 5/4 5/4 1/1; --> 5 1 %e A046580 1/1 9/4 5/2 9/4 1/1; --> 9 1 %e A046580 1/1 13/4 19/4 19/4 13/4 1/1; %e A046580 1/1 17/4 8/1 19/2 8/1 17/4 1/1; %e A046580 1/1 21/4 49/4 35/2 35/2 49/4 21/4 1/1; ... %Y A046580 Cf. A046563. %K A046580 tabf,nonn,frac,less %O A046580 1,3 %A A046580 _Mohammad K. Azarian_ %E A046580 More terms from Don Gray (s1171480(AT)cedarville.edu) %E A046580 Data corrected by _Sean A. Irvine_, Apr 13 2021