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%I #10 Feb 23 2020 08:38:00
%S 1,2,5,21,166,2277,49901,1675904,84239935,6231045077,668949067432,
%T 103005162942955,22511886374045653,6918461813753405930,
%U 2965189776573865320121,1759287329824925168339697,1435531006280642249195752862,1601571709194974043628781397985,2430449338115875591262479128994073
%N Partial sums of A006058.
%C Partial sums of number of connected labeled topologies with n points. The subsequence of primes in this partial sum begins: 2, 5, and then what?
%F a(n) = Sum_{i=0..n} A006058(i) = Sum_{i=0..n} Sum_{k=0..i-1} C(i, k)*A000798(k) (for i>=1).
%t Cases[Import["https://oeis.org/A006058/b006058.txt", "Table"], {_, _}][[All, 2]] // Accumulate (* _Jean-François Alcover_, Jan 01 2020 *)
%Y Cf. A000798, A006058.
%K nonn
%O 0,2
%A _Jonathan Vos Post_, Apr 19 2010
%E a(16)-a(18) from _Jinyuan Wang_, Feb 23 2020