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 A126653 #15 Jan 26 2019 11:11:36 %S A126653 24,3,18,9,15,21,12,27,6 %N A126653 A 3 X 3 magic square with magic sum 45: the Loh-Shu square A033812 multiplied by 3. %C A126653 The magic sum is 45. See Figure C.6 in Appendix C in Maya Ahmed's PhD thesis. %H A126653 Maya Mohsin Ahmed, <a href="https://arxiv.org/abs/math/0405476">Algebraic Combinatorics of Magic Squares</a>, arXiv:math/0405476 [math.CO], 2004. PhD thesis. %H A126653 Maya Mohsin Ahmed, <a href="https://www.jstor.org/stable/4145267">How many squares are there, Mr. Franklin?: Constructing and Enumerating Franklin Squares</a>, Amer. Math. Monthly, Vol. 111, 2004, pp. 394-410. %H A126653 <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a> %F A126653 a(n) = 3*A033812(n). - _M. F. Hasler_, Jan 26 2019 %e A126653 The magic square is: %e A126653 24 3 18 %e A126653 9 15 21 %e A126653 12 27 6 %Y A126653 Cf. A126652 for 5*A033812. %K A126653 fini,full,nonn,tabf %O A126653 1,1 %A A126653 _Parthasarathy Nambi_, Feb 08 2007 %E A126653 Edited by _M. F. Hasler_, Jan 26 2019