%I #3 Jun 20 2016 13:23:14
%S 1,4,192,23040,5160960,1857945600,980995276800,714164561510400,
%T 685597979049984000,839171926357180416000,1275541328062914232320000,
%U 2357200374260265501327360000,5204698426366666226930810880000,13532215908553332190020108288000000
%N A bisection of A002866.
%Y Cf. A002671, A002866.
%K nonn
%O 0,2
%A _N. J. A. Sloane_, Jun 20 2016
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