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a(n) = A136007(n)*(A136007(n)+1)/2.
0

%I #3 Mar 30 2012 17:33:56

%S 6,28,496,8128,33550336,8589869056,137438691328,2305843008139952128,

%T 2658455991569831744654692615953842176,

%U 14474011154664524427946373126085988481573677491474835889066354349131199152128

%N a(n) = A136007(n)*(A136007(n)+1)/2.

%C Different from A000396.

%Y Cf. A000396, A136007.

%K nonn

%O 1,1

%A _Omar E. Pol_, Dec 15 2008