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 A027463 #5 Mar 30 2012 17:20:43 %S A027463 1,65,865,153713,200403,84873489,807843807,25265669869,28682861185, %T A027463 42667254975995,47094524452625,113048851861209965,122484165188229545, %U A027463 131772609157313825,1127325729624166675,5892299098094866152275 %N A027463 Second column of A027448. %F A027463 Numerators of sequence a[ 2, n ] in (a[ i, j ])^4 where a[ i, j ] = 1/i if j<=i, 0 if j>i %K A027463 nonn %O A027463 2,2 %A A027463 _Olivier Gérard_