A174136 Partial sums of A003087.

1, 2, 4, 10, 41, 343, 6327, 249995, 20536020, 3445474030, 1169394086932, 798731069436512, 1094825607339329108, 3006942191342795594938, 16533858553282474307626008, 181924651566316766693192987410

Offset

0,2

Comments

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).

Links

Table of n, a(n) for n=0..15.

Formula

a(n) = SUM[i=0..n] A003087(i).

Crossrefs

Cf. A003087, A003024.

Sequence in context: A159860 A013549 A184253 * A125805 A344790 A028404

Adjacent sequences: A174133 A174134 A174135 * A174137 A174138 A174139

Keyword

nonn

Author

Jonathan Vos Post, Mar 09 2010

Status

approved