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 A046570 #9 Jul 02 2025 16:01:57 %S A046570 1,4,5,9,2,13,19,17,8,21,49,35,25,119,29,95,189,259,33,31,71,112,37, %T A046570 157,102,183,483,41,97,565,285,849,45,235,759,1705,1419,1815,70,497, %U A046570 616,4543,1617,53,329,637,1729,7007,11011,3432,57,191,1603,1183,10465 %N A046570 Distinct numbers in writing first numerator and then denominator of each element of the 1/4-Pascal triangle (by row). %e A046570 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 A046570 Cf. A046563. %K A046570 tabf,nonn %O A046570 1,2 %A A046570 _Mohammad K. Azarian_ %E A046570 More terms from _James Sellers_, Dec 14 1999