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 A046587 #9 Jul 02 2025 16:01:57 %S A046587 4,4,4,4,2,4,4,4,4,4,4,8,2,8,4,4,4,2,2,4,4,4,2,4,4,2,4,4,4,4,4,4,4,4, %T A046587 4,4,112,2,112,4,4,4,102,2,2,102,4,4,4,2,4,2,2,4,2,4,4,4,4,4,2,2,2,2, %U A046587 4,4,4,4,4,70,2,616,4,4,616,2,70,4,4,4,2,2,4,4,3432,3432,4,4,2,2,4,4,4,2,4 %N A046587 Even numbers in writing first numerator and then denominator of each element of the 1/4-Pascal triangle (by row). %e A046587 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 A046587 Cf. A046563. %K A046587 tabf,nonn %O A046587 1,1 %A A046587 _Mohammad K. Azarian_ %E A046587 More terms from _James Sellers_, Dec 14 1999