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 A156836 #6 Jun 02 2025 01:23:29 %S A156836 1,1,1,1,0,2,1,2,0,2,1,0,0,0,4,1,3,6,0,0,2,1,0,0,0,0,0,6,1,4,0,8,0,0, %T A156836 0,4,1,0,12,0,0,0,0,0,6,1,5,0,0,20,0,0,0,0,4,1,0,0,0,0,0,0,0,0,0,10,1, %U A156836 6,20,20,0,12,0,0,0,0,0,4,1,0,0,0,0,0,0,0,0,0,0,0,12 %N A156836 Triangle read by rows, A156348 * A130207. %C A156836 Row sums = A156834: (1, 2, 3, 5, 5, 12, 7, 17, 19, 30, 11,...). %F A156836 Triangle read by rows, A156348 * A130207, where A130207 = an infinite lower %F A156836 triangular matrix with A000010 as the main diagonal and the rest zeros. %e A156836 First few rows of the triangle = %e A156836 1; %e A156836 1, 1; %e A156836 1, 0, 2; %e A156836 1, 2, 0, 2; %e A156836 1, 0, 0, 0, 4; %e A156836 1, 3, 6, 0, 0, 2; %e A156836 1, 0, 0, 0, 0, 0, 6; %e A156836 1, 4, 0, 8, 0, 0, 0, 4; %e A156836 1, 0, 12, 0, 0, 0, 0, 0, 6; %e A156836 1, 5, 0, 0, 20, 0, 0, 0, 0, 4; %e A156836 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10; %e A156836 1, 6, 20, 20, 0, 12, 0, 0, 0, 0, 0, 4; %e A156836 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12; %e A156836 1, 7, 0, 0, 0, 0, 42, 0, 0, 0, 0, 0, 0, 6; %e A156836 ... %Y A156836 Cf. A156348, A130207, A156834, A000010 %K A156836 nonn,tabl %O A156836 1,6 %A A156836 _Gary W. Adamson_ & _Mats Granvik_, Feb 16 2009