%I A088980
%S A088980 1,1,1,0,2,1,2,1,4,3,5,4,7,6,8,7,12,11,15,14,20,19,24,23,31,30,37,36,45,
%T A088980 44,52,51,64,63,75,74,90,89,104,103,124,123,143,142,167,166,190,189,221,
%U A088980 220,251,250,288,287,324,323,369,368,413,412,465,464,516,515,580
%N A088980 G.f.: 1 + x + Sum_{n >= 1} ( x^(2^n)/ ((1+x^(2^(n-1)))*Product_{j=0..n-1} 
               (1-x^(2^j)) ) ).
%e A088980 1 + x + x^2/((1 + x)*(1 - x)) + x^4/((1 + x^2)*(1 - x)*(1 - x^2)) + x^8/
               ((1 + x^4)*(1 - x)*(1 - x^2)*(1 - x^4)) + ...
%Y A088980 Apart from initial terms, same as A088931.
%Y A088980 Sequence in context: A160595 A105778 A088931 this_sequence A157333 A002852 
               A099875
%Y A088980 Adjacent sequences: A088977 A088978 A088979 this_sequence A088981 A088982 
               A088983
%K A088980 nonn
%O A088980 0,5
%A A088980 N. J. A. Sloane (njas(AT)research.att.com), Dec 02 2003