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 A144199 #9 Aug 07 2018 17:57:53 %S A144199 0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0, %T A144199 0,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0 %N A144199 Square array (8 X 8) read by rows. %C A144199 Permutation contributing to the determinant that gives the 4th value of the Möbius function. Determinant of matrix is equal to 1. The array is asymmetrical. %H A144199 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 A144199 The array is: %e A144199 0,0,0,0,0,0,0,1 %e A144199 1,0,0,0,0,0,0,0 %e A144199 0,0,1,0,0,0,0,0 %e A144199 0,0,0,1,0,0,0,0 %e A144199 0,0,0,0,1,0,0,0 %e A144199 0,0,0,0,0,1,0,0 %e A144199 0,0,0,0,0,0,1,0 %e A144199 0,1,0,0,0,0,0,0 %Y A144199 Cf. A143104, A002033, A144198, A144200. %K A144199 fini,full,nonn,tabf %O A144199 1,1 %A A144199 _Mats Granvik_, Sep 13 2008