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 A050305 #5 Dec 19 2015 13:18:39 %S A050305 1,-2,1,1,-2,1,3,-1,-2,1,-2,4,-1,-2,1,-2,2,2,-1,-2,1,-3,-1,3,2,-1,-2, %T A050305 1,-1,-4,3,1,2,-1,-2,1,5,-5,-5,4,1,2,-1,-2,1,4,-4,-2,-1,2,1,2,-1,-2,1, %U A050305 5,1,-5,-3,0,2,1,2,-1,-2,1,1,7,-5,-4,1,-2,2,1,2,-1,-2,1,1,6,2,-5,-5,2 %N A050305 Matrix square of inverse partition triangle A038498. %e A050305 1; -2,1; 1,-2,1; 3,-1,-2,1; ... %Y A050305 Cf. A050306-A050313. %K A050305 sign,tabl %O A050305 1,2 %A A050305 _Christian G. Bower_, Aug 15 1999