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 A137587 #8 Apr 02 2022 09:25:50 %S A137587 1,2,1,3,0,1,5,2,0,1,6,1,0,0,1,11,3,2,0,0,1,12,2,1,0,0,0,1,20,6,1,2,0, %T A137587 0,0,1,25,4,3,1,0,0,0,0,1,37,9,2,1,2,0,0,0,0,1,43,8,3,1,1,0,0,0,0,0,1, %U A137587 70,16,6,3,1,2,0,0,0,0,0,1 %N A137587 Triangle read by rows: A051731 * A026794. %C A137587 That is, regard A051731 and A026794 as lower triangular square matrices and multiply them, then take the lower triangle of the product, %C A137587 Left column = A083710 starting (1, 2, 3, 5, 6, 11, 12, ...). %C A137587 Row sums = A047968. %F A137587 Inverse mobius transform of the partition triangle, A026794. %e A137587 First few rows of the triangle: %e A137587 1; %e A137587 2, 1; %e A137587 3, 0, 1; %e A137587 5, 2, 0, 1; %e A137587 6, 1, 0, 0, 1; %e A137587 11, 3, 2, 0, 0, 1; %e A137587 12, 2, 1, 0, 0, 0, 1; %e A137587 20, 6, 1, 2, 0, 0, 0, 1; %e A137587 25, 4, 3, 1, 0, 0, 0, 0, 1; %e A137587 ... %Y A137587 Cf. A026794, A051731, A083710, A047968. %K A137587 nonn,tabl %O A137587 1,2 %A A137587 _Gary W. Adamson_, Jan 27 2008 %E A137587 Typo in 9th row corrected by _M. F. Hasler_, Jun 08 2009