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 A124816 #2 Mar 30 2012 18:59:18 %S A124816 1,0,1,0,0,1,0,1,1,1,0,0,2,1,1,0,3,3,3,2,1,0,0,7,4,5,2,1,0,12,12,12, %T A124816 10,6,3,1,0,0,30,18,24,12,9,3,1,0,55,55,55,50,32,22,10,4,1,0,0,143,88, %U A124816 121,66,57,25,14,4,1,0,273,273,273 %N A124816 Product of Riordan array (1,x(1-x^2))^(-1) and number triangle T(n,k)=C(floor(k/2),n-k). %C A124816 Product of A124305 and A124788. Columns include aerated A001764,A047749(n+1),A124817,A084081. Row sums are A124818. %e A124816 Triangle begins %e A124816 1, %e A124816 0, 1, %e A124816 0, 0, 1, %e A124816 0, 1, 1, 1, %e A124816 0, 0, 2, 1, 1, %e A124816 0, 3, 3, 3, 2, 1, %e A124816 0, 0, 7, 4, 5, 2, 1, %e A124816 0, 12, 12, 12, 10, 6, 3, 1, %e A124816 0, 0, 30, 18, 24, 12, 9, 3, 1, %e A124816 0, 55, 55, 55, 50, 32, 22, 10, 4, 1 %Y A124816 Cf. A124790. %K A124816 nonn,tabl %O A124816 0,13 %A A124816 _Paul Barry_, Nov 08 2006