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 A157030 #8 Jun 02 2025 01:24:30 %S A157030 1,2,0,2,1,0,4,0,1,0,2,1,1,1,0,8,3,0,0,1,0,2,1,1,1,1,1,0,10,0,5,0,1,0, %T A157030 1,0,8,7,0,1,1,0,1,1,0,12,5,6,5,0,0,10,1,0,2,1,1,1,1,1,1,1,1,1,0,34, %U A157030 10,10,0,7,0,10,0,0,1,0 %N A157030 Triangle read by rows, A156834 * A054521. %C A157030 Left border = A157019: (1, 2, 2, 4, 2, 8, 2, 10,...). %F A157030 Triangle read by rows, A156834 * A054521; as infinite lower triangular matrices. %e A157030 First few rows of the triangle = %e A157030 1; %e A157030 2, 0; %e A157030 2, 1, 0; %e A157030 4, 0, 1, 0; %e A157030 2, 1, 1, 1, 0; %e A157030 8, 3, 0, 0, 1, 0; %e A157030 2, 1, 1, 1, 1, 1, 0; %e A157030 10, 0, 5, 0, 1, 0, 1, 0; %e A157030 8, 7, 0, 1, 1, 0, 1, 1, 0; %e A157030 12, 5, 6, 5, 0, 0, 10, 1, 0; %e A157030 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0; %e A157030 34, 10, 10, 0, 7, 0, 1, 0, 0, 0, 1, 0; %e A157030 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0; %e A157030 ... %Y A157030 Cf. A156834 (row sums), A054521. %K A157030 nonn,tabl,more %O A157030 1,2 %A A157030 _Gary W. Adamson_ and _Mats Granvik_, Feb 21 2009