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Ceiling of ((2^n)!)/(2^(n*(n+1))*Product((2^i-1)^2,i=1..n)).
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%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