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 A182728 #16 Jan 20 2019 23:20:34 %S A182728 1,4,2,9,8,3,20,18,12,4,35,40,27,16,5,66,70,60,36,20,6,105,132,105,80, %T A182728 45,24,7,176,210,198,140,100,54,28,8,270,352,315,264,175,120,63,32,9, %U A182728 420,540,528,420,330,210,140,72,36,10,616,840,810,704,525,396,245,160,81,40,11 %N A182728 Array T(n,k) = n*k*A000041(n) read by antidiagonals, n,k >= 1. %e A182728 Array begins: %e A182728 1, 2, 3, 4, 5, 6, 7, ... %e A182728 4, 8, 12, 16, 20, 24, 28, ... %e A182728 9, 18, 27, 36, 45, 54, 63, ... %e A182728 20, 40, 60, 80, 100, 120, 140, ... %e A182728 35, 70, 105, 140, 175, 210, 245, ... %e A182728 66, 132, 198, 264, 330, 396, 462, ... %e A182728 105, 210, 315, 420, 525, 630, 735, ... %p A182728 A182728 := proc(n,k) n*k*combinat[numbpart](n) ; end proc: %p A182728 seq(seq( A182728(d+1-k, k), k=1..d), d=1..10) ; # _R. J. Mathar_, Feb 01 2011 %Y A182728 Cf. A000041, A135010, A182729, A183011. %Y A182728 Column 1 gives A066186. Column 24 gives A183009. %K A182728 nonn,easy,tabl %O A182728 1,2 %A A182728 _Omar E. Pol_, Jan 22 2011