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A259326 Ceiling of ((2^n)!+(2^n-1)^2*(2^(n-1))!*2^(2^(n-1)))/(4^n*(n!)^2). 2
1, 2, 26, 141907500, 17844701940490373256193966080, 59757436204078657410908164193971177467473348779378572774972093904092502425600000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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

# Maple code for A259326, A259327, A259328, A259329, A259330, A259331:

f:=n->((2^n)!+(2^n-1)^2*(2^(n-1))!*2^(2^(n-1)))/(4^n*(n!)^2);

f:=n->((2^n)!)/(4^n*(n!)^2);

f:=n->((2^n)!)/(2^(n*(n-1))*mul((2^i-1)^2, i=1..n));

f:=n->((2^n)!)/(4^(n^2));

f:=n->((2^n)!)/(2^(n*(n+1))*mul((2^i-1)^2, i=1..n));

f:=n->((2^n)!)/(4^n*2^(2*n^2));

[seq(ceil(f(n)), n=1..6)];

CROSSREFS

Cf. A259327, A259328, A259329, A259330, A259331.

Sequence in context: A330032 A273381 A094680 * A061192 A259789 A041883

Adjacent sequences:  A259323 A259324 A259325 * A259327 A259328 A259329

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 24 2015

STATUS

approved

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Last modified August 14 10:58 EDT 2022. Contains 356116 sequences. (Running on oeis4.)