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 A137649 #8 Apr 02 2022 10:11:49 %S A137649 1,2,1,3,4,1,4,11,7,1,5,26,32,11,1,6,57,122,76,16,1,7,120,423,426,156, %T A137649 22,1,8,247,1389,2127,1206,288,29,1,9,502,4414,9897,8157,2934,491,37, %U A137649 1,10,1013,13744,44002,50682,25761,6371,787,46,1 %N A137649 Triangle read by rows, A000012 * A008277. %C A137649 Row sums = A024716: (1, 3, 8, 23, 75, 278, ...). %C A137649 A137650 = A008277 * A000012. %F A137649 A000012 * A008277 (Stirling2 triangle) as infinite lower triangular matrices. Partial column sums of A008277. %e A137649 First few rows of the triangle: %e A137649 1; %e A137649 2, 1; %e A137649 3, 4, 1; %e A137649 4, 11, 7, 1; %e A137649 5, 26, 32, 11, 1; %e A137649 6, 57, 122, 76, 16, 1; %e A137649 7, 120, 423, 426, 156, 22, 1; %e A137649 ... %e A137649 Row 4 = (4, 11, 7, 1) = partial column sums of the first 4 rows of A008277: %e A137649 1; %e A137649 1, 1; %e A137649 1, 3, 1; %e A137649 1, 7, 6, 1; %e A137649 ... %Y A137649 Cf. A024716, A008277, A137650. %K A137649 nonn,tabl %O A137649 1,2 %A A137649 _Gary W. Adamson_, Feb 01 2008