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Incorrect duplicate of A058307.
1

%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