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 A083406 #31 Aug 01 2019 01:07:32 %S A083406 63504,435600,6350400,7683984,16240900,25401600,43560000,66585600, %T A083406 420332004,558471424,635040000,647804304,726949444,768398400, %U A083406 782432784,1067328900,1624090000,1897473600,2341011456,2540160000 %N A083406 Even squares which can be expressed as the product of a number and its reversal in at least two different ways. %C A083406 For n=1..49 identical to A083408. %D A083406 S. S. Gupta, EPRNs, Science Today, Feb. 1987, India. %H A083406 Chai Wah Wu, <a href="/A083406/b083406.txt">Table of n, a(n) for n = 1..2372</a> (first 73 terms from Hans Havermann) %H A083406 Shyam Sunder Gupta, <a href="http://www.shyamsundergupta.com/eporns.htm">Equal Product of Reversible Numbers</a> %e A083406 63504 = 252 * 252 = 144 * 441, 7683984 = 2772 * 2772 = 1584 * 4851, etc. %Y A083406 Cf. A031877, A066531, A083407 (odd squares version), A083408 (all squares version). %K A083406 nonn,base %O A083406 1,1 %A A083406 _Shyam Sunder Gupta_, Jun 07 2003 %E A083406 Corrected and extended by _Hans Havermann_, Feb 11 2012 %E A083406 Definition corrected by _N. J. A. Sloane_, Aug 01 2019