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 A125005 #2 Mar 31 2012 14:45:33 %S A125005 0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,1, %T A125005 0,1,0,1,1,0,0,2,0,0,1,1,0,1,0,1,1,0,0,2,0,0,1,1,0,1,0,1,1,0,1,2,0,0, %U A125005 1,2,0,1,0,1,2,0,0,2,0,1,1,1,0,1,1,1,1,0,0,3,0,0,1,1,1,1,0,1,1,1,0,2,0,0,2 %N A125005 Numbers of orders of nontrivial positive magic-squares with magic sum n. A nontrivial positive magic square is a k-by-k array of consecutive positive integers (not necessarily including 1) such that all rows, all columns and the two diagonals each add up to the same constant (the "magic sum"), with the additional restriction that k (the "order") is greater than 1. %e A125005 A125005(15)=1 because there is exactly one order k > 1 (namely k = 3) such that there exists a magic square of order k having the magic sum 15. By adding 1 to each table cell of one such magic square, a magic square with magic sum 18 is obtained, hence A125005(18) = 1 as well. %Y A125005 Cf. A125006, A125007, A125008, A125009, A125010, A125011, A125012, A125013, A125014, A125015, A125016, A125017. %K A125005 easy,nonn %O A125005 1,42 %A A125005 _Jens Voß_, Nov 15 2006