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A046856
a(n) = (2^n)!/4^n, with a(1)=1, a(2)=2.
3
1, 2, 630, 81729648000, 256963707943060088053923840000000, 30978254928194376001814792318154658399137088909801072314160618743948902400000000000000
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OFFSET
1,2
COMMENTS
The next term has 212 digits. -
Harvey P. Dale
, May 31 2021
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
a:= n-> ceil((2^n)!/4^n):
seq(a(n), n=1..6); #
Alois P. Heinz
, May 31 2021
MATHEMATICA
Join[{1, 2}, Table[(2^n)!/4^n, {n, 3, 6}]] (*
Harvey P. Dale
, May 31 2021 *)
CROSSREFS
Sequence in context:
A291340
A332162
A364070
*
A156938
A285221
A079195
Adjacent sequences:
A046853
A046854
A046855
*
A046857
A046858
A046859
KEYWORD
nonn
,
easy
AUTHOR
N. J. A. Sloane
STATUS
approved
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Last modified July 16 17:03 EDT 2024. Contains 374358 sequences. (Running on oeis4.)