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 A144197 #9 Aug 07 2018 12:55:51 %S A144197 0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0, %T A144197 0,0,0,0,0,0,1,0,1,0,0,0,0,0,0 %N A144197 Square array 7 x 7 read by rows. %C A144197 Permutation contributing to the determinant that gives the 7th value of the Möbius function. Determinant of matrix is equal to -1. The array is symmetrical. %H A144197 Herbert S. Wilf, <a href="https://arxiv.org/abs/math/0408263">The Redheffer matrix of a partially ordered set</a>, arXiv:math/0408263 [math.CO], 2004. %e A144197 The array is: %e A144197 0,0,0,0,0,0,1 %e A144197 0,1,0,0,0,0,0 %e A144197 0,0,1,0,0,0,0 %e A144197 0,0,0,1,0,0,0 %e A144197 0,0,0,0,1,0,0 %e A144197 0,0,0,0,0,1,0 %e A144197 1,0,0,0,0,0,0 %Y A144197 Cf. A143104, A002033, A144196, A144198. %K A144197 fini,full,nonn,tabf %O A144197 1,1 %A A144197 _Mats Granvik_, Sep 13 2008