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Partials sums of A007080.
0

%I #2 Mar 30 2012 18:40:52

%S 1,3,13,165,7901,1383853,879285501,2047199658621,17660268902020093,

%T 569790880105867285245,69280640454268889757533693

%N Partials sums of A007080.

%C Partials sums of number of labeled Eulerian digraphs with n nodes. The subsequence of primes in this partial sum begins: 3, 13, 7901, 1383853, 17660268902020093.

%F a(n) = SUM[i=1..n] A007080(i).

%e a(5) = 1 + 2 + 10 + 152 + 7736 = 7901 is prime.

%Y Cf. A007080.

%K nonn

%O 1,2

%A _Jonathan Vos Post_, Apr 15 2010