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 A333439 #20 Jun 29 2023 13:21:26 %S A333439 2,8,98,4112,532270,212372938,263708907212,1013068026356376, %T A333439 11955420069208095720,432101605951906251627394, %U A333439 47778407166747833830058004150,16149888968763663448192636077980754,16675786862526496319891707194153887550752,52568166380872328447478940416604864445574575710 %N A333439 a(n) = A333438(n)/2. %H A333439 Ed Wynn, <a href="/A333439/b333439.txt">Table of n, a(n) for n = 2..19</a> %Y A333439 Cf. A271507, A333246, A333438. %K A333439 nonn %O A333439 2,1 %A A333439 _Seiichi Manyama_, Mar 21 2020 %E A333439 a(11) and a(13) from _Seiichi Manyama_ %E A333439 More terms from _Ed Wynn_, Jun 29 2023