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 A125692 #6 Dec 29 2023 11:52:42 %S A125692 1,-1,1,0,-2,1,1,1,-3,1,0,2,3,-4,1,-2,-2,2,6,-5,1,0,-4,-6,0,10,-6,1,5, %T A125692 5,-3,-11,-5,15,-7,1,0,10,15,4,-15,-14,21,-8,1,-14,-14,6,26,19,-15, %U A125692 -28,28,-9,1,0,-28,-42,-16,30,42,-7,-48,36,-10,1 %N A125692 Riordan array (1-x*c(-x^2),x(1-x*c(-x^2))) where c(x) is the g.f. of A000108. %C A125692 Row sums are aerated signed Catalan numbers with g.f. c(-x^2). Inverse of A105306. First column is A105523. %e A125692 Triangle begins %e A125692 1, %e A125692 -1, 1, %e A125692 0, -2, 1, %e A125692 1, 1, -3, 1, %e A125692 0, 2, 3, -4, 1, %e A125692 -2, -2, 2, 6, -5, 1, %e A125692 0, -4, -6, 0, 10, -6, 1 %e A125692 Contribution from _Paul Barry_, Apr 18 2010: (Start) %e A125692 Production matrix begins %e A125692 -1, 1, %e A125692 -1, -1, 1, %e A125692 -1, -1, -1, 1, %e A125692 -1, -1, -1, -1, 1, %e A125692 -1, -1, -1, -1, -1, 1, %e A125692 -1, -1, -1, -1, -1, -1, 1, %e A125692 -1, -1, -1, -1, -1, -1, -1, 1, %e A125692 -1, -1, -1, -1, -1, -1, -1, -1, 1, %e A125692 -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, %e A125692 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1 (End) %K A125692 easy,sign,tabl %O A125692 0,5 %A A125692 _Paul Barry_, Nov 30 2006