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 A137679 #10 May 29 2023 11:25:44 %S A137679 1,2,1,3,2,1,4,4,2,1,5,6,4,2,1,6,9,7,4,2,1,7,12,11,7,4,2,1,8,16,16,12, %T A137679 7,4,2,1,9,20,23,18,12,7,4,2,1,10,25,31,27,19,12,7,4,2,1,11,30,41,38, %U A137679 29,19,12,7,4,2,1,12,36,53,53,42,30,19,12,7,4,2,1 %N A137679 Triangle read by rows, A000012 * A008284. %C A137679 Row sums = A026905: (1, 3, 6, 11, 18, 29, ...). %C A137679 Rows tend to A000070 starting from the right: (1, 2, 4, 7, 12, 19, 30, ...). %F A137679 A000012 * A008284 as infinite lower triangular matrices. %e A137679 First few rows of the triangle: %e A137679 1; %e A137679 2, 1; %e A137679 3, 2, 1; %e A137679 4, 4, 2, 1; %e A137679 5, 6, 4, 2, 1; %e A137679 6, 9, 7, 4, 2, 1; %e A137679 7, 12, 11, 7, 4, 2, 1; %e A137679 8, 16, 16, 12, 7, 4, 2, 1; %e A137679 ... %Y A137679 Cf. A000070, A008284, A026905. %K A137679 nonn,tabl %O A137679 1,2 %A A137679 _Gary W. Adamson_, Feb 05 2008 %E A137679 a(38) = 20 corrected by _Georg Fischer_, May 29 2023