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%I #5 Jun 27 2012 13:58:09
%S 1,3,27,6939,1819024155,4000076419257644882715,
%T 77372730618755190082837640023742562619343248155,
%U 237146729315719909074685533605289611245100501015339264129426202250460094330698830235303562543675218715
%N An auxiliary bit-mask sequence for computing A066425. (The "clean", symmetric one).
%H A. Karttunen, <a href="/A066425/a066425s.txt">Scheme functions for computing A066425 and related sequences.</a>
%F a(1)=1, a(n) = ((2^(A068739(n-1)+A068059(n-1)-1))+1)*a(n-1)
%Y The corresponding "dirty" bit-mask sequence is A068222. This sequence in binary: A068223. The width of these bit-masks is given by A068739.
%K nonn
%O 1,2
%A _Antti Karttunen_, Feb 26 2002
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