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 A130329 #11 Jul 24 2024 03:05:49 %S A130329 1,5,2,21,10,4,85,42,20,8,341,170,84,40,16,1365,682,340,168,80,32, %T A130329 5461,2730,1364,680,336,160,64,21845,10922,5460,2728,1360,672,320,128, %U A130329 87381,43690,21844,10920,5456,2720,1344,640,256 %N A130329 A059268 * A130321. %C A130329 Row sums = A006095: (1, 7, 35, 155, 651, 2667, ...). %C A130329 Left border = A002450: (1, 5, 21, 85, 341, 1365, ...). %C A130329 A130328 = A130321 * A059268. %F A130329 A059268 * A130321 as infinite lower triangular matrices. %e A130329 First few rows of the triangle: %e A130329 1; %e A130329 5, 2; %e A130329 21, 10, 4; %e A130329 85, 42, 20, 8; %e A130329 341, 170, 84, 40, 16; %e A130329 ... %Y A130329 Cf. A059268, A130321, A006095, A002450, A130328. %K A130329 nonn,tabl %O A130329 0,2 %A A130329 _Gary W. Adamson_, May 24 2007