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 A104472 #9 Aug 30 2019 03:37:02 %S A104472 1,2,4,3,5,8,4,8,11,15,5,9,12,16,21,6,12,18,22,27,33,7,13,19,23,28,34, %T A104472 41,8,16,22,30,35,41,48,56,9,17,26,34,39,45,52,60,69,10,20,29,37,47, %U A104472 53,60,68,77,87,11,21,30,38,48,54,61,69,78,88,99,12,24,36,48,58,70,77,85 %N A104472 Triangle of degree numbers for certain polynomials. %C A104472 This is the array ay(N,m)= A104471(n+m-1,m) with numbers m>N omitted because they are identical with ay(N,N). %C A104472 a(n,m)=sum(j*floor(n/j),j=1..m), n>=m and zero else (but actually one should repeat the a(n,n) numbers for n<m). %H A104472 W. Lang: <a href="/A104472/a104472.txt">First 10 rows.</a> %e A104472 [1]; [2,4]; [3,5,8]; [4,8,11,15]; [5,9,12,16,21]; ... %Y A104472 Main diagonal a(n, n)= A024916(n), n>=1. %K A104472 nonn,easy,tabl %O A104472 1,2 %A A104472 _Wolfdieter Lang_, Mar 24 2005