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%I #34 Sep 25 2021 13:11:12
%S 1,2,5,16,53,206,817,3620,16361,80218,401501,2139512,11641885,
%T 66599846,388962953,2367284236,14700573137,94523836850,619674301621,
%U 4186249123808,28809504493061,203556335785342,1463877667140065
%N Duplicate of A018191.
%K dead
%O 0,2
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