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 A126650 #10 Jul 12 2018 11:41:43 %S A126650 71,1,51,32,50,2,80,3,79,21,41,61,56,26,13,69,25,57,31,81,11,20,62,65, %T A126650 17,63,19,34,40,60,43,28,64,18,55,27,48,42,22,54,39,75,7,10,72,33,53, %U A126650 15,68,16,44,58,77,5,49,29,67,14,66,24,38,59,23,76,4,70,73,8,37,36,30,35,6,78,12,9,74,45,46,47,52 %N A126650 A 9 x 9 magic square. %C A126650 The magic sum is 369. See Figure C.4 in Appendix C in Maya Ahmed's PhD thesis. %H A126650 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 A126650 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. %e A126650 The magic square is: %e A126650 71 1 51 32 50 2 80 3 79 %e A126650 21 41 61 56 26 13 69 25 57 %e A126650 31 81 11 20 62 65 17 63 19 %e A126650 34 40 60 43 28 64 18 55 27 %e A126650 48 42 22 54 39 75 7 10 72 %e A126650 33 53 15 68 16 44 58 77 5 %e A126650 49 29 67 14 66 24 38 59 23 %e A126650 76 4 70 73 8 37 36 30 35 %e A126650 6 78 12 9 74 45 46 47 52 %K A126650 fini,full,nonn,tabf %O A126650 1,1 %A A126650 _Parthasarathy Nambi_, Feb 08 2007