%I #4 Mar 30 2012 17:33:58
%S 1,3,11,43,2091,34859,165931,537036843,576460752840460331,
%T 154742505487133287202850859,40564973949808827981181705422891,
%U 42535336430091257741749807110676449323
%N Sum of first n even superperfect numbers A061652, divided by 2.
%C Also, sum of first n superperfect numbers A019279, divided by 2, if there are no odd superperfect numbers.
%F a(n) = A153475(n)/2 [From _Max Alekseyev_, Jul 27 2009]
%Y Cf. A153474, A153475.
%K nonn
%O 1,2
%A _Omar E. Pol_, Dec 27 2008
%E More terms from _Max Alekseyev_, Jul 27 2009