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 A027454 #5 Mar 30 2012 17:20:43 %S A027454 1,1,8,27,1728,1000,216000,1157625,21952000,16003008,16003008000, %T A027454 12326391000,21300003648000,17053975224000,13865513485824, %U A027454 91398648466125,374368864117248000,315376239610432000 %N A027454 First diagonal of A027448. %F A027454 Numerators of sequence a[ n, n ] in (a[ i, j ])^4 where a[ i, j ] = 1/i if j<=i, 0 if j>i %K A027454 nonn %O A027454 1,3 %A A027454 _Olivier Gérard_