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 A268854 #37 Dec 17 2018 18:41:03 %S A268854 39,24,21,15,18,24,189,67734 %N A268854 a(n) is the smallest magic sum of any 3 X 3 magic square which contains exactly n triangular numbers. %H A268854 Andrew Bremner, <a href="http://www.multimagie.com/Bremner2.pdf">On squares of squares II</a>, Acta Arithmetica 99 (2001), pp. 289-308. %H A268854 Multimagic Squares, <a href="http://www.multimagie.com/English/SmallestTriangularExpanded.htm#Unsolved1Order3">An unsolved problem</a> %H A268854 The Prime Puzzles and Problems Connection, <a href="http://www.primepuzzles.net/problems/prob_063.htm">Problem 63</a> %H A268854 The Prime Puzzles and Problems Connection, <a href="http://www.primepuzzles.net/puzzles/puzz_079.htm">Puzzle 79</a> %H A268854 Arkadiusz Wesolowski, <a href="/A268854/a268854.txt">Examples of these magic squares</a> %H A268854 Wikipedia, <a href="https://en.wikipedia.org/wiki/Magic_square">Magic square</a> %H A268854 <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a> %Y A268854 Cf. A221669, A268855, A268856, A269231, A271020. %K A268854 nonn,fini,hard,more %O A268854 0,1 %A A268854 _Arkadiusz Wesolowski_, Feb 14 2016