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 A136102 #2 Mar 31 2012 13:23:39 %S A136102 1,1,2,1,2,4,6,12,1,2,4,6,8,12,24,30,36,60,72,120,180,360,1,2,4,6,8, %T A136102 12,16,24,30,36,48,60,72,120,144,180,210,216,240,360,420,32,720,840, %U A136102 900,1080,1260,1680,1800,2160,2520,3600,5040,5400,6300,7560,10800,12600 %N A136102 Triangle read by rows, in which rows give signatures for Ferrers boards fitting inside staircases coded 1, 2, 12, 360, 75600, ... (see A006939). %C A136102 The number of signatures on each row is 1 2 5 14 42 132 ... cf. A000108. %D A136102 G. E. Andrews and K. Eriksson, Integer Partitions, Cambridge Univ. Press, 2004. page 22 Exer. 33. %e A136102 The irregular array begins %e A136102 1 %e A136102 1 2 %e A136102 1 2 4 6 12 %e A136102 1 2 4 6 8 12 24 30 36 60 72 120 180 360 %Y A136102 Cf. A000041 A000108 A006939 A025487. %K A136102 easy,nonn,tabf %O A136102 1,3 %A A136102 _Alford Arnold_, Jan 12 2008