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 A063066 #4 May 29 2017 09:06:12
%S A063066 9,24,45,64,72,105,120,144,189,192,225,240,280,297,360,384,429,504,
%T A063066 525,576,585,640,672,720,765,792,840,864,945,960,969,1080,1144,1152,
%U A063066 1197,1200,1225,1320,1344,1449,1485,1512,1560,1584,1680,1725,1792,1800,1872
%N A063066 Numbers expressible as (a^2-1)(b^2-1).
%H A063066 K. S. Brown, <a href="http://www.mathpages.com/home/kmath275.htm">Numbers Expressible as (a^2-1)(b^2-1)</a>
%e A063066 45 is on the list because 45=(2^2-1)(4^2-1)
%t A063066 With[{nn=50},Take[(#[[1]]^2-1)(#[[2]]^2-1)&/@Tuples[Range[2,nn],2]//Union,nn]] (* _Harvey P. Dale_, May 29 2017 *)
%Y A063066 Cf. A057535, A063067, A063068.
%K A063066 nonn
%O A063066 1,1
%A A063066 _Henry Bottomley_, Jul 08 2001