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 A131255 #4 Feb 18 2022 22:43:33 %S A131255 1,0,1,0,1,1,1,0,2,1,0,1,1,3,1,0,1,1,3,4,1,1,0,2,2,6,5,1,0,1,1,3,5,10, %T A131255 6,1,0,1,1,3,5,11,15,7,1,1,0,2,2,6,10,21,21,8,1 %N A131255 A004070 * A000012(signed). %C A131255 Row sums = A004695 starting (1, 1, 2, 4, 6, 10, 17, 27, 44, 72, ...). A058393 = A000012(signed) * A004070. %F A131255 A004070 * A000012, where A000012 = (1; -1,1; 1,-1,1; ...). %e A131255 First few rows of the triangle: %e A131255 1; %e A131255 0, 1; %e A131255 0, 1, 1; %e A131255 1, 0, 2, 1; %e A131255 0, 1, 1, 3, 1; %e A131255 0, 1, 1, 3, 4, 1; %e A131255 1, 0, 2, 2, 6, 5, 1; %e A131255 0, 1, 1, 3, 5, 10, 6, 1; %e A131255 0, 1, 1, 3, 5, 11, 15, 7, 1; %e A131255 1, 0, 2, 2, 6, 10, 2, 21, 8, 1; %e A131255 ... %Y A131255 Cf. A004070, A000012, A004695, A058393. %K A131255 nonn,tabl %O A131255 0,9 %A A131255 _Gary W. Adamson_, Jun 23 2007