%I #5 Aug 16 2015 17:30:40
%S 1,1,1,202,2569966024555163105,
%T 76230976900860740792605252290337123070878181006452224000000000000
%N Ceiling of ((2^n)!)/(2^(n*(n+1))*Product((2^i-1)^2,i=1..n)).
%H C. S. Lorens, <a href="http://dx.doi.org/10.1109/PGEC.1964.263724">Invertible Boolean functions</a>, IEEE Trans. Electron. Computers, EC-13 (1964), 529-541.
%H C. S. Lorens, <a href="/A000722/a000722.pdf">Invertible Boolean functions</a>, IEEE Trans. Electron. Computers, EC-13 (1964), 529-541. [Annotated scan of page 530 only]
%K nonn
%O 1,4
%A _N. J. A. Sloane_, Jun 24 2015