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 A138650 #4 May 24 2013 21:38:41 %S A138650 1,1,1,1,1,2,1,1,2,1,4,1,1,2,2,4,4,6,1,1,2,2,4,1,8,7,2,11,9,1,1,2,2,4, %T A138650 2,8,7,6,5,21,11,9,24,12,1 %N A138650 Table where T(n,k) is the number of unordered trees with n edges (n+1 nodes) whose node out-degrees form the k-th partition of the integer n (in Mathematica order). %e A138650 For the partition [2,1^2] (a(10)=T(4,4)) there are the four trees: %e A138650 ..o.....o.....o.....o %e A138650 ./.\.../.\....|.....| %e A138650 o...o.o...o...o.....o %e A138650 |...|.|....../.\....| %e A138650 o...o.o.....o...o...o %e A138650 ......|.....|....../.\ %e A138650 ......o.....o.....o...o %e A138650 Table T(n,k) begins: %e A138650 1; %e A138650 1; %e A138650 1, 1; %e A138650 1, 2, 1; %e A138650 1, 2, 1, 4, 1; %e A138650 1, 2, 2, 4, 4, 6, 1; %e A138650 1, 2, 2, 4, 1, 8, 7, 2, 11, 9, 1; %e A138650 1, 2, 2, 4, 2, 8, 7, 6, 5, 21, 11, 9, 24, 12, 1; %Y A138650 Cf. A000041 (row lengths), A000081 (row sums), A125181. %K A138650 more,nonn,tabf %O A138650 0,6 %A A138650 _Franklin T. Adams-Watters_, May 15 2008