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A068221 An auxiliary bit-mask sequence for computing A066425. (The "clean", symmetric one). 5

%I

%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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Last modified October 21 16:25 EDT 2019. Contains 328302 sequences. (Running on oeis4.)