A259331 Ceiling of ((2^n)!)/(4^n*2^(2*n^2)).

1, 1, 1, 20, 228229620041151627, 6559900643155884106407005800995037605507731066841784640626478359

Offset

1,4

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]

Maple

f:=n->((2^n)!)/(4^n*2^(2*n^2));
[seq(ceil(f(n)), n=1..6)];

Crossrefs

Cf. A259326, A259327, A259328, A259329, A259330.

Sequence in context: A172834 A271976 A182370 * A364863 A209614 A167263

Adjacent sequences: A259328 A259329 A259330 * A259332 A259333 A259334

Keyword

nonn

Author

N. J. A. Sloane, Jun 24 2015

Status

approved