%I #10 Dec 30 2019 10:27:20
%S 1,2,6,35,390,7332,216859,9752100,652531454,63912820877,9040966693920,
%T 1825887005430112,521181458071204133,208402575114740157174,
%U 115825454552169007964634,88852094573138413500449755,93499965506283177978710943850,134231450058844163850300579669696,261626767193693218968916427480786899
%N Partial sums of A000798.
%C Number of different quasi-orders (or topologies, or transitive digraphs) with n labeled elements.
%C The subsequence of primes in this partial sum begins: 2, 216859.
%F a(n) = Sum_{i=0..n} A000798(i).
%t Cases[Import["https://oeis.org/A000798/b000798.txt", "Table"], {_, _}][[All, 2]] // Accumulate (* _Jean-François Alcover_, Dec 30 2019 *)
%Y Cf. A000798, A001035 (labeled posets), A001930 (unlabeled topologies), A000112 (unlabeled posets), A006057.
%K nonn
%O 0,2
%A _Jonathan Vos Post_, Feb 17 2010
%E Missing term 7332 added and extended by _Jean-François Alcover_, Dec 30 2019