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 A124394 #2 Mar 30 2012 18:59:18
%S A124394 1,0,1,-1,0,1,-2,-2,0,1,-3,-4,-3,0,1,-4,-5,-6,-4,0,1,-5,-4,-6,-8,-5,0,
%T A124394 1,-6,0,0,-6,-10,-6,0,1,-7,8,14,8,-5,-12,-7,0,1,-8,21,36,36,20,-3,-14,
%U A124394 -8,0,1,-9,40,63,72,65,36,0,-16,-9,0,1
%N A124394 Inverse of Fine number renewal array.
%C A124394 Inverse of A065600. Row sums are A057681(n+1). Diagonal sums are A124395.
%F A124394 Riordan array ((1-2x)/(1-x)^2,x(1-2x)/(1-x)^2); Number triangle T(n,k)=sum{j=0..k+1, C(k+1,j)C(n-j+k+1,2k+1)(-2)^j};
%e A124394 Triangle begins
%e A124394 1,
%e A124394 0, 1,
%e A124394 -1, 0, 1,
%e A124394 -2, -2, 0, 1,
%e A124394 -3, -4, -3, 0, 1,
%e A124394 -4, -5, -6, -4, 0, 1,
%e A124394 -5, -4, -6, -8, -5, 0, 1,
%e A124394 -6, 0, 0, -6, -10, -6, 0, 1
%K A124394 easy,sign,tabl
%O A124394 0,7
%A A124394 _Paul Barry_, Oct 30 2006