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 A237519 #11 Feb 09 2014 14:26:47 %S A237519 1,4,8,13,2,19,2,26,7,34,7,43,13,53,13,3,64,20,3,76,20,3,89,28,10,103, %T A237519 28,10,118,37,10,134,37,18,151,47,18,4,169,47,18,4,188,58,27,4,208,58, %U A237519 27,4,229,70,27,13,251,70,37,13,274,83,37,13,298,83,37,13,323,97,48,23,349,97,48,23,5 %N A237519 Triangle read by rows: T(n,k), n>=1, k>=1, in which column k lists the partial sums of the column k of A237273 starting in row k^2. %C A237519 The sum of row n is A024916(n), the sum of all divisors of all positive integers <= n. %C A237519 Row n has length A000196(n). %C A237519 Column 1 is A034856. %C A237519 Column 2 lists the elements of A155212 repeated. %C A237519 Column 3 lists the elements of A051938 repeated with three copies of every element. %C A237519 Column k contains k copies of every element. %e A237519 Triangle begins: %e A237519 1; %e A237519 4; %e A237519 8; %e A237519 13, 2; %e A237519 19, 2; %e A237519 26, 7; %e A237519 34, 7; %e A237519 43, 13; %e A237519 53, 13, 3; %e A237519 64, 20, 3; %e A237519 76, 20, 3; %e A237519 89, 28, 10; %e A237519 103, 28, 10; %e A237519 118, 37, 10; %e A237519 134, 37, 18; %e A237519 151, 47, 18, 4; %e A237519 169, 47, 18, 4; %e A237519 188, 58, 27, 4; %e A237519 208, 58, 27, 4; %e A237519 229, 70, 27, 13; %e A237519 251, 70, 37, 13; %e A237519 274, 83, 37, 13; %e A237519 298, 83, 37, 13; %e A237519 323, 97, 48, 23; %e A237519 349, 97, 48, 23, 5; %e A237519 ... %Y A237519 Cf. A000203, A000196, A024916, A034856, A051938, A155212, A236104, A235791, A237273. %K A237519 nonn,tabf %O A237519 1,2 %A A237519 _Omar E. Pol_, Feb 08 2014