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 A050312 #5 Dec 19 2015 13:04:16 %S A050312 1,-9,1,36,-9,1,-39,27,-9,1,-114,-3,27,-9,1,264,-117,-12,27,-9,1,81, %T A050312 111,-81,-12,27,-9,1,-429,192,108,-90,-12,27,-9,1,-69,-153,30,144,-90, %U A050312 -12,27,-9,1,284,-387,39,27,135,-90,-12,27,-9,1,364,101,-234,-123,63 %N A050312 Matrix 9th power of inverse partition triangle A038498. %e A050312 1; -9,1; 36,-9,1; -39,27,-9,1; ... %Y A050312 Cf. A050305-A050313. %K A050312 sign,tabl %O A050312 1,2 %A A050312 _Christian G. Bower_, Aug 15 1999