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 A090914 #2 Mar 30 2012 17:30:56
%S A090914 1,1,12,1800,3528000,93350880000,34157460395520000,
%T A090914 176018448722253096960000,12957844528516872887046144000000,
%U A090914 13783997562964632581368087262085120000000
%N A090914 Reciprocal of (n+1)! times determinant of n X n matrix whose (i,j)-th element is 1/(i+j).
%t A090914 Table[ 1 / Det[ Table[ 1 / (i + j), {i, 1, n}, {j, 1, n} ]]/(n + 1)!, {n, 1, 10}]
%o A090914 (PARI) a(n)=if(n<0,0,1/((n+1)!*matdet(matrix(n,n,i,j,1/(i+j)))))
%Y A090914 A067689/(n+1)!
%K A090914 nonn
%O A090914 0,3
%A A090914 _Robert G. Wilson v_, Feb 26 2004