%I A081972
%S A081972 1,1,4,34,528,16644,1056832,134744072,34426978560,17609382707216,
%T A081972 18023198899569664,36902497546234101792,151134176447977081540608,
%U A081972 1238015601761073699807559744,20283028592561355523908308058112
%N A081972 Consider the geometric progression 1,1/2,1/4,1/8,1/16,1/32,1/64,... group 
               the terms such that the n-th group contains n terms like this (1/
               1),(1/2,1/4),(1/8,1/16,1,32),(1/64,1/128,1/256,1/512),... a(n) = 
               floor[1/s(n)] where s(n) is the sum of the members of the n-th group.
%F A081972 a(n) = floor((2^(n*(n+1)/2 - 1))/(2^n-1))
%Y A081972 Sequence in context: A156325 A111169 A002105 this_sequence A158961 A134354 
               A030243
%Y A081972 Adjacent sequences: A081969 A081970 A081971 this_sequence A081973 A081974 
               A081975
%K A081972 nonn
%O A081972 1,3
%A A081972 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 03 2003
%E A081972 Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), 
               Apr 08 2003