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 A125021 #7 Mar 12 2020 09:04:57 %S A125021 0,2,4,8,10,16,18,20,26,32,34,36,40,52,58,64,68,72,74,80,82,90,98,104, %T A125021 106,116,122,128,136,144,146,148,160,162,164,178,180,194,196,202,208, %U A125021 212,218,226,232,234,242,244,256,272,274,288,292,296,298,306,314 %N A125021 Even numbers with a unique partition as the sum of 2 squares x^2 + y^2. %H A125021 Amiram Eldar, <a href="/A125021/b125021.txt">Table of n, a(n) for n = 1..10000</a> %t A125021 Select[2 * Range[0, 200], Length @ PowersRepresentations[#, 2, 2] == 1 &] (* _Amiram Eldar_, Mar 12 2020 *) %Y A125021 Cf. A002145, A124982, A125022. %K A125021 nonn %O A125021 1,2 %A A125021 _Artur Jasinski_, Nov 16 2006, corrected Nov 18 2006