This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A176315 #2 Mar 30 2012 18:40:52 %S A176315 1,3,13,165,7901,1383853,879285501,2047199658621,17660268902020093, %T A176315 569790880105867285245,69280640454268889757533693 %N A176315 Partials sums of A007080. %C A176315 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 A176315 a(n) = SUM[i=1..n] A007080(i). %e A176315 a(5) = 1 + 2 + 10 + 152 + 7736 = 7901 is prime. %Y A176315 Cf. A007080. %K A176315 nonn %O A176315 1,2 %A A176315 _Jonathan Vos Post_, Apr 15 2010