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%I #25 Jun 19 2020 04:06:52
%S 1,1,2,3,7,12,24,45,91,176,352,693,1387,2752,5504,10965,21931,43776,
%T 87552,174933,349867,699392,1398784,2796885,5593771,11186176,22372352,
%U 44741973,89483947,178962432,357924864,715838805,1431677611,2863333376,5726666752
%N Duplicate of A018240.
%K dead
%O 3,3