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%I A174136 #2 Mar 30 2012 18:40:51
%S A174136 1,2,4,10,41,343,6327,249995,20536020,3445474030,1169394086932,
%T A174136 798731069436512,1094825607339329108,3006942191342795594938,
%U A174136 16533858553282474307626008,181924651566316766693192987410
%N A174136 Partial sums of A003087.
%C A174136 Partial sums of number of acyclic digraphs with n unlabeled nodes; equivalently partial sums of the number of equivalence classes of n X n real (0,1)-matrices with all eigenvalues positive, up to conjugation by permutations. The subsequence of primes in this partial sum begins: 2, 41, no more through a(18).
%F A174136 a(n) = SUM[i=0..n] A003087(i).
%Y A174136 Cf. A003087, A003024.
%K A174136 nonn
%O A174136 0,2
%A A174136 _Jonathan Vos Post_, Mar 09 2010

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