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 A046611 #13 Aug 04 2025 11:23:54 %S A046611 1,1,5,1,5,12,5,46,1,34,1,126,5,2352,5,8844,5,33462,1,25454,1,97240,5, %T A046611 1864356,5,7171892,5,27665596,1,21395520,1,82907640,1,321868854,1, %U A046611 1251661518,1,4874644104,1,19010020260,1,74225053980,1,290134122564,1 %N A046611 First denominator and then numerator of the central elements of the 1/5-Pascal triangle (by row). %e A046611 Triangle of the fractions begins as: %e A046611 1/1; %e A046611 1/1, 1/1; %e A046611 1/1, 1/5, 1/1; %e A046611 1/1, 6/5, 6/5, 1/1; %e A046611 1/1, 11/5, 12/5, 11/5, 1/1; %e A046611 1/1, 16/5, 23/5, 23/5, 16/5, 1/1; %e A046611 1/1, 21/5, 39/5, 46/5, 39/5, 21/5, 1/1; %e A046611 1/1, 26/5, 12/1, 17/1, 17/1, 12/1, 26/5, 1/1; %e A046611 ... %Y A046611 Cf. A046601. %K A046611 nonn %O A046611 1,3 %A A046611 _Mohammad K. Azarian_ %E A046611 More terms from _James Sellers_, Dec 15 1999