OFFSET
1,2
LINKS
C. S. Lorens, Invertible Boolean functions, IEEE Trans. Electron. Computers, EC-13 (1964), 529-541.
C. S. Lorens, Invertible Boolean functions, IEEE Trans. Electron. Computers, EC-13 (1964), 529-541. [Annotated scan of page 530 only]
MAPLE
f:=n->((2^n)!+(2^n-1)^2*(2^(n-1))!*2^(2^(n-1)))/(4^n*(n!)^2);
f:=n->((2^n)!)/(4^n*(n!)^2);
f:=n->((2^n)!)/(2^(n*(n-1))*mul((2^i-1)^2, i=1..n));
f:=n->((2^n)!)/(4^(n^2));
f:=n->((2^n)!)/(2^(n*(n+1))*mul((2^i-1)^2, i=1..n));
f:=n->((2^n)!)/(4^n*2^(2*n^2));
[seq(ceil(f(n)), n=1..6)];
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 24 2015
STATUS
approved