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 A048664 #19 Sep 09 2019 01:47:11
%S A048664 1,4,18,76,315,1296,5320,21800,89190,364460,1487948,6070332,24750570,
%T A048664 100868236,410919990,1673486992,6813529348,27734769756,112874034844,
%U A048664 459295593200,1868653768443,7601716598916,30920563717052,125759730486432,511445050400275,2079809585544808,8457048866652588,34386482811155244
%N A048664 Number of rooted 2-dimensional polyominoes with n square cells, with no symmetries removed.
%D A048664 Dan Hoey, Bill Gosper and Richard C. Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999.
%H A048664 Jean-François Alcover, <a href="/A048664/b048664.txt">Table of n, a(n) for n = 1..56</a>
%H A048664 R. C. Schroeppel, <a href="http://www.experimentalmath.info/workshop2004/schroeppel-talk.pdf">A few mathematical experiments</a>, Experimental Mathematics Workshop, Oakland, 2004.
%F A048664 a(n) = n * A001168(n). - _Andrew Howroyd_, Dec 04 2018
%t A048664 A001168 = Cases[Import["https://oeis.org/A001168/b001168.txt", "Table"], {_, _}][[All, 2]];
%t A048664 a[n_] := n A001168[[n]];
%t A048664 Array[a, 56] (* _Jean-François Alcover_, Sep 08 2019, after _Andrew Howroyd_ *)
%Y A048664 Cf. A001168, A048663.
%Y A048664 A row of A094166.
%K A048664 nonn
%O A048664 1,2
%A A048664 _Dan Hoey_
%E A048664 More terms from Richard C. Schroeppel, May 04 2004