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%I #6 Jan 08 2020 17:50:00
%S 0,4,64,1912,148432,32871240,20744801272,37559607987584,
%T 198461813970383240,3100218604533034920976,
%U 144170284249598867501946128,20038589080922552365824887715432,8349298401437323416105571304163524760,10453318954664242363219930783045003561923656
%N Summed lengths of nonintersecting rook paths on an n X n board.
%C Paths are self-avoiding from one corner to the diagonally opposite corner.
%e For 2 x 2: right+down (length 2), down+right (length 2), s(2) = 2+2 = 4
%Y Main diagonal of A181399.
%Y Related sequences A181394, A181395, A181396, A181397.
%K nonn
%O 1,2
%A _David Scambler_, Oct 17 2010
%E a(7)-a(14) from _Andrew Howroyd_, Jan 07 2020
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