Search: id:A104602
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%I A104602
%S A104602 1,2,10,70,642,7246,97052,1503700,26448872,520556146,11333475922,
%T A104602 270422904986,7016943483450,196717253145470,5925211960335162,
%U A104602 190825629733950454,6543503207678564364,238019066600097607402
%N A104602 Number of square (0,1)-matrices with exactly n entries equal to 1 and 
               no zero row or columns.
%C A104602 Number of square (0,1)-matrices with exactly n entries equal to 1 and 
               no zero row or columns, up to row and column permutation, is A057151(n). 
               - Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 25 2006
%H A104602 M. Maia and M. Mendez, <a href="http://arXiv.org/abs/math.CO/0503436">
               On the arithmetic product of combinatorial species</a>
%F A104602 a(n) = (1/n!)*Sum_{k=0..n} Stirling1(n,k)*A048144(k). - Vladeta Jovovic 
               (vladeta(AT)eunet.rs), Mar 25 2006
%F A104602 G.f.: Sum_{n>=0} Sum_{j=0..n} (-1)^(n-j)*binomial(n,j)*((1+x)^j-1)^n. 
               - Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 25 2006
%Y A104602 Row sums of triangle A104601.
%Y A104602 Sequence in context: A036075 A123881 A089845 this_sequence A118748 A118752 
               A060842
%Y A104602 Adjacent sequences: A104599 A104600 A104601 this_sequence A104603 A104604 
               A104605
%K A104602 nonn
%O A104602 1,2
%A A104602 Ralf Stephan, Mar 27 2005
%E A104602 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 25 2006

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