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 A119836 #2 Mar 30 2012 18:59:15 %S A119836 1,-2,2,0,-24,12,0,0,-360,120,0,0,0,-6720,1680,0,0,0,0,-151200,30240, %T A119836 0,0,0,0,0,-3991680,665280,0,0,0,0,0,0,-121080960,17297280,0,0,0,0,0, %U A119836 0,0,-4151347200,518918400,0,0,0,0,0,0,0,0,-158789030400,17643225600,0,0,0,0,0,0,0,0,0,-6704425728000,670442572800 %N A119836 Bi-diagonal inverse of [k<=n]*n!/(2k)!. %C A119836 Row sums are A119837. T(n,n)=A001813(n). T(n,n-1)=2*A001814(n) %F A119836 Triangle T(n,n)=(2n)!/n!,T(n,n-1)=(2n)!/(n-1)!,T(n,k)=0 otherwise. %e A119836 Triangle begins %e A119836 1, %e A119836 -2, 2, %e A119836 0, -24, 12, %e A119836 0, 0, -360, 120, %e A119836 0, 0, 0, -6720, 1680, %e A119836 0, 0, 0, 0, -151200, 30240, %e A119836 0, 0, 0, 0, 0, -3991680, 665280, %e A119836 0, 0, 0, 0, 0, 0, -121080960, 17297280, %e A119836 0, 0, 0, 0, 0, 0, 0, -4151347200, 518918400, %e A119836 0, 0, 0, 0, 0, 0, 0, 0, -158789030400, 17643225600, %e A119836 0, 0, 0, 0, 0, 0, 0, 0, 0, -6704425728000, 670442572800 %K A119836 easy,sign,tabl %O A119836 0,2 %A A119836 _Paul Barry_, May 25 2006