%I #16 Oct 07 2019 14:36:28
%S 0,1,3,13,68,420,3015,24541,223884,2263381,25121075,303716281,
%T 3973432728,55931774473,842950049823,13543132571641,231076203767720,
%U 4172914800390601
%N Incorrect duplicate of A058307.
%H <a href="/A121954/b121954.txt">Table of n, a(n) for n = 0..17</a>
%K dead
%O 0,3