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 A129237 #4 Feb 18 2022 22:30:54 %S A129237 1,3,2,4,0,3,7,5,0,4,6,0,0,0,5,12,6,7,0,0,6,8,0,0,0,0,0,7,15,10,0,9,0, %T A129237 0,0,8,13,0,8,0,0,0,0,0,9,18,8,0,0,11,0,0,0,0,10 %N A129237 A051731 * A129234. %C A129237 Left border = Sigma(n), A000203: (1, 3, 4, 7, 6, 12, 8, ...). A129236 = Moebius transform of A129234. %F A129237 A051731 * A129234 as infinite lower triangular matrices. %e A129237 First few rows of the triangle: %e A129237 1; %e A129237 3, 2; %e A129237 4, 0, 3; %e A129237 7, 5, 0, 4; %e A129237 6, 0, 0, 0, 5; %e A129237 12, 6, 7, 0, 0, 6; %e A129237 8, 0, 0, 0, 0, 0, 7; %e A129237 15, 10, 0, 9, 0, 0, 0, 8; %e A129237 ... %Y A129237 Cf. A129234, A129235, A129236, A054525, A051731, A000203. %K A129237 nonn,tabl %O A129237 1,2 %A A129237 _Gary W. Adamson_, Apr 05 2007