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%I #53 May 16 2020 15:25:38
%S 1,1,7,31,175,991,5881,35617,219871,1376095,8710537,55644337,
%T 358198369,2320792657,15120204295,98984058271,650725327231,
%U 4293779332927,28425752310361,188739799967425,1256510215733185
%N Duplicate of A172634.
%H <a href="/A208446/b208446.txt">Table of n, a(n) for n = 0..20</a>
%K dead
%O 0,3
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