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 A188317 #7 Mar 30 2012 18:59:29 %S A188317 1,0,1,-1,-1,1,2,-1,-2,1,-1,6,0,-3,1,-6,-10,10,2,-4,1,20,-4,-26,13,5, %T A188317 -5,1,-22,63,14,-49,14,9,-6,1,-49,-148,112,58,-78,12,14,-7,1,260,45, %U A188317 -396,144,138,-111,6,20,-8,1,-441,755,435,-789,123,263,-145,-5,27,-9,1 %N A188317 Riordan array, inverse of (1/(1-x^2), x/((1-x)*(1-x^2))). %C A188317 Inverse of number triangle A188316. %e A188317 Triangle begins %e A188317 1, %e A188317 0, 1, %e A188317 -1, -1, 1, %e A188317 2, -1, -2, 1, %e A188317 -1, 6, 0, -3, 1, %e A188317 -6, -10, 10, 2, -4, 1, %e A188317 20, -4, -26, 13, 5, -5, 1, %e A188317 -22, 63, 14, -49, 14, 9, -6, 1, %e A188317 -49, -148, 112, 58, -78, 12, 14, -7, 1, %e A188317 260, 45, -396, 144, 138, -111, 6, 20, -8, 1 %e A188317 Production matrix begins %e A188317 0, 1, %e A188317 -1, -1, 1, %e A188317 1, -1, -1, 1, %e A188317 0, 1, -1, -1, 1, %e A188317 0, 0, 1, -1, -1, 1, %e A188317 0, 0, 0, 1, -1, -1, 1, %e A188317 0, 0, 0, 0, 1, -1, -1, 1, %e A188317 0, 0, 0, 0, 0, 1, -1, -1, 1, %e A188317 0, 0, 0, 0, 0, 0, 1, -1, -1, 1 %K A188317 sign,tabl %O A188317 0,7 %A A188317 _Paul Barry_, Mar 28 2011