%I A099050
%S A099050 1,1,3,8,19,42,92,194,398,808,1638,3334,6686,13392,26842,53708,107450,
%T A099050 214952,430148,860340,1720826,3441688,6883446,13766950,27533998,
%U A099050 55068040,110136196,220272460,440545040,881090532,1762181454,3524362990
%N A099050 a(1)=1; for n>=2, a(n)=sum(1<=i<=j<=n-1, gcd(a(i),a(j))).
%F A099050 a(n) is asymptotic to c*2^n where c=0.8205797305404015389561...
%Y A099050 Sequence in context: A002318 A095681 A079583 this_sequence A065352 A161993 
               A008466
%Y A099050 Adjacent sequences: A099047 A099048 A099049 this_sequence A099051 A099052 
               A099053
%K A099050 nonn
%O A099050 1,3
%A A099050 Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 13 2004