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%I #7 Nov 03 2020 06:33:50
%S 0,0,0,0,2,4,12,20,42,76,144,256,488,892,1672,3092,5798,10856,20512,
%T 38652,73344,139212,265312,506464,969552,1858784,3571368,6871692,
%U 13244040,25558888,49392068,95555560,185075058,358812020,696308312,1352420168,2628949868
%N Number of closed binary words of length n that are not privileged.
%H G. Badkobeh, G. Fici, Z. Lipták, <a href="http://dx.doi.org/10.1007/978-3-319-15579-1_29">On the number of closed factors in a word</a>, in A.-H. Dediu et al., eds., LATA 2015, LNCS 8977, 2015, pp. 381-390. Available at <a href="http://arxiv.org/abs/1305.6395">arXiv</a>, arXiv:1305.6395 [cs.FL], 2013-2014.
%H Gabriele Fici, <a href="http://bulletin.eatcs.org/index.php/beatcs/article/view/508">Open and Closed Words</a>, in Giovanni Pighizzini, ed., The Formal Language Theory Column, Bulletin of EATCS, 2017.
%Y Equals A226452-A231208.
%Y Cf. A297185.
%K nonn
%O 0,5
%A _N. J. A. Sloane_, Dec 28 2017
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