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 A342283 #5 Apr 26 2021 21:55:53 %S A342283 0,1,1,3,12,55,275,1461,8121,46760,276990,1679692,10388794,65348331, %T A342283 417122415,2696925449,17636415027,116508178394,776713914842, %U A342283 5220901613826,35357775815996,241100774277388,1654405307080112,11418270330490544,79229054480527932,552492413404591296 %N A342283 a(n) = A342282(n)/2. %Y A342283 Cf. A342282. %K A342283 nonn %O A342283 0,4 %A A342283 _N. J. A. Sloane_, Mar 19 2021