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 A300952 #8 Apr 06 2018 15:34:01 %S A300952 1,1,2,2,7,7,35,43,238,341,1981,3030,18649,29597,190809,311294, %T A300952 2072334,3462486,23551368,40166551,277378932,481159175,3362641488, %U A300952 5912848608,41749776145,74210799645,528856595713,948300730648,6814672450367,12308638880274,89116042070616 %N A300952 Number of Dyck paths of semilength n having equal areas above the path and below the path, measured within the smallest enclosing rectangle based on the x-axis. %H A300952 Alois P. Heinz, <a href="/A300952/b300952.txt">Table of n, a(n) for n = 0..51</a> %H A300952 Wikipedia, <a href="https://en.wikipedia.org/wiki/Lattice_path#Counting_lattice_paths">Counting lattice paths</a> %e A300952 .__________. %e A300952 a(5) = 7: | /\ | %e A300952 .______________________________________________________| / \ | %e A300952 | /\/\ | /\ | /\ | /\ | /\/\ | / \ | %e A300952 .__________| / \ | / \/\/\ | /\/ \/\ | /\/\/ \ | / \ | / \ | %e A300952 |/\/\/\/\/\|/______\/\|/________\|/________\|/________\|/\/______\|/________\| . %Y A300952 Column k=0 of A300953. %Y A300952 Cf. A000108, A300323. %K A300952 nonn %O A300952 0,3 %A A300952 _Alois P. Heinz_, Mar 16 2018