A259327 Ceiling of ((2^n)!)/(4^n*(n!)^2).

1, 1, 18, 141891750, 17844701940490283892633600000, 59757436204078657410908164193971177467471236322918735173920946651136000000000000

Offset: 1

Author

N. J. A. Sloane, Jun 24 2015

Keywords

• nonn

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]