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 A050310 #5 Dec 19 2015 13:17:43 %S A050310 1,-7,1,21,-7,1,-7,14,-7,1,-77,14,14,-7,1,77,-63,7,14,-7,1,105,-7,-42, %T A050310 7,14,-7,1,-71,98,7,-49,7,14,-7,1,-90,62,7,28,-49,7,14,-7,1,-97,-112, %U A050310 104,21,21,-49,7,14,-7,1,49,-118,-21,13,42,21,-49,7,14,-7,1,111,71 %N A050310 Matrix 7th power of inverse partition triangle A038498. %e A050310 1; -7,1; 21,-7,1; -7,14,-7,1; ... %Y A050310 Cf. A050305-A050313. %K A050310 sign,tabl %O A050310 1,2 %A A050310 _Christian G. Bower_, Aug 15 1999