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A046857
a(n) = (2^n)!/(n!^2).
3
2, 6, 1120, 36324288000, 18272974787062050706056806400000, 244766458691906180755079840538505942906762183978675139272380197483053056000000000000
OFFSET
1,1
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]
CROSSREFS
Sequence in context: A113569 A252739 A178773 * A129454 A317251 A140258
KEYWORD
nonn,easy
STATUS
approved