%I
%S 1,14,312,13945,1241696,196846257,50828091505,20024754905438,
%T 11449549613245851,9132012077055635872,9838890888977921645318,
%U 13943876645976749962479951,25420022651057340998037064594,58486800791746378910741227427387
%N Number of cycles in the 3 X n rook graph.
%H Andrew Howroyd, <a href="/A341501/b341501.txt">Table of n, a(n) for n = 1..30</a>
%Y Column 3 of A286418.
%K nonn
%O 1,2
%A _Andrew Howroyd_, Feb 21 2021
