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 A046612 #9 Jul 02 2025 16:01:57 %S A046612 1,5,12,46,34,126,2352,8844,33462,25454,97240,1864356,7171892, %T A046612 27665596,21395520,82907640,321868854,1251661518,4874644104, %U A046612 19010020260,74225053980,290134122564,1135234789728,4446052592904,17427428373420 %N A046612 Distinct numbers in writing first numerator and then denominator of the central elements of the 1/5-Pascal triangle (by row). %e A046612 1/1; 1/1 1/1; 1/1 1/5 1/1; 1/1 6/5 6/5 1/1; 1/1 11/5 12/5 11/5 1/1; 1/1 16/5 23/5 23/5 16/5 1/1; 1/1 21/5 39/5 46/5 39/5 21/5 1/1; 1/1 26/5 12/1 17/1 17/1 12/1 26/5 1/1; ... %Y A046612 Cf. A046601. %K A046612 nonn %O A046612 1,2 %A A046612 _Mohammad K. Azarian_ %E A046612 More terms from _James Sellers_, Dec 16 1999