A177451 - OEIS

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

%S 1,4,26,281,3602,56550,1121538,26193063,693887458,20808594004,

%T 699641607622,26001947464541,1059148042622186,47015706166302146,

%U 2260884753582320442,117153802097975691651,6513779162975806691634

%N Partial sums of A054595.

%C Partial sums of number of labeled 2-connected minimally 2-edge-connected graphs by nodes. The only prime in the partial sum values shown is 281.

%F a(n) = SUM[i=3..n] A054595(i).

%e a(6) = 1 + 3 + 22 + 255 = 281 is prime.

%Y Cf. A054595, A054317, A001072, A054596.

%K nonn

%O 3,2

%A _Jonathan Vos Post_, May 09 2010