A046857 a(n) = (2^n)!/(n!^2).

2, 6, 1120, 36324288000, 18272974787062050706056806400000, 244766458691906180755079840538505942906762183978675139272380197483053056000000000000

Offset

1,1

Links

Table of n, a(n) for n=1..6.

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

Adjacent sequences: A046854 A046855 A046856 * A046858 A046859 A046860

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved