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%I #10 May 30 2017 00:08:30
%S 1,4,2,2,1,4,1,4,2,2,2,4,1,2,2,2,1,4,2,2,2,2,1,4,1,4,2,2,1,4,1,2,2,2,
%T 2,4,1,4,2,2,1,4,1,4,2,2,2,2,1,4,1,2,2,4,1,4,2,2,1,4,1,4,2,2,2,4,1,2,
%U 2,2,1,4,1,4,2,2,2,2,1,4,2,2,2,4,1,2,2,2,2,4,1,4,2,2,1,4,1,2,2,4,1,4,1,2,2
%N Sum of terms in n-th block of Kolakoski sequence.
%F a(n) = (3+(-1)^n)/2*A000002(n).
%Y Cf. A000002.
%K nonn
%O 1,2
%A _Benoit Cloitre_, Nov 17 2003
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