%I A091478
%S A091478 1,1,1,1,3,6,6,1,6,30,120,360,720,720,1,10,90,720,5040,30240,151200,
%T A091478 604800,1814400,3628800,3628800,1,15,210,2730,32760,360360,3603600,
%U A091478 32432400,259459200,1816214400,10897286400,54486432000,217945728000
%N A091478 Table of graphs with n (>=1) nodes and k (>=0) edges. Each type of object 
               labeled from its own label set.
%D A091478 F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like 
               Structures, Cambridge, 1998, pg 114 (2.4.44)
%F A091478 a(n, k) = k!*binomial(binomial(n, 2), k).
%e A091478 1; 1,1; 1,3,6,6; 1,6,30,120,360,720,720; Row lengths in A000124(n+1).
%Y A091478 Row sums: A091479. Columns 0-2: A000012, A000217(n-1), A033487(n-2).
%Y A091478 a(n, A000217(n-1)) = A052295(n-1). Cf. A006125, A008406.
%Y A091478 Sequence in context: A152422 A152139 A021736 this_sequence A086727 A021277 
               A016662
%Y A091478 Adjacent sequences: A091475 A091476 A091477 this_sequence A091479 A091480 
               A091481
%K A091478 nonn,tabf
%O A091478 1,5
%A A091478 Christian G. Bower (bowerc(AT)usa.net), Jan 13 2004