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%I #5 Mar 30 2012 18:39:23
%S 1,1,3,8,19,42,92,194,398,808,1638,3334,6686,13392,26842,53708,107450,
%T 214952,430148,860340,1720826,3441688,6883446,13766950,27533998,
%U 55068040,110136196,220272460,440545040,881090532,1762181454,3524362990
%N a(1)=1; for n>=2, a(n)=sum(1<=i<=j<=n-1, gcd(a(i),a(j))).
%F a(n) is asymptotic to c*2^n where c=0.8205797305404015389561...
%K nonn
%O 1,3
%A _Benoit Cloitre_, Nov 13 2004
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