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 A050306 #5 Dec 19 2015 13:18:31 %S A050306 1,-3,1,3,-3,1,5,0,-3,1,-8,8,0,-3,1,-5,0,5,0,-3,1,-1,-8,3,5,0,-3,1,5, %T A050306 -9,0,0,5,0,-3,1,17,-3,-15,3,0,5,0,-3,1,6,4,-2,-7,0,0,5,0,-3,1,-1,15, %U A050306 0,-8,-4,0,0,5,0,-3,1,-14,20,1,-2,0,-7,0,0,5,0,-3,1,-11,2,19,0,-8,3 %N A050306 Matrix cube of inverse partition triangle A038498. %e A050306 1; -3,1; 3,-3,1; 5,0,-3,1; ... %Y A050306 Cf. A050305-A050313. %K A050306 sign,tabl %O A050306 1,2 %A A050306 _Christian G. Bower_, Aug 15 1999