A285180 - OEIS

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A285180

Normalized number of n^2 X n^2 Sudokus.

3

1, 1, 12, 18383222420692992

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OFFSET

0,3

COMMENTS

Equals A107739(n)/((n^2)!).

Note that although the two Yordzhev papers have similar titles, they are different papers.

LINKS

Table of n, a(n) for n=0..3.

Krasimir Yordzhev, On the Number of Disjoint Pairs of S-permutation Matrices, arXiv:12112:1628 [math.CO], 2012.

Krasimir Yordzhev, On the number of mutually disjoint pairs of S-permutation matrices, Discrete Mathematics 340 (2017) 1442-1448.

CROSSREFS

Cf. A107739, A285178, A285179.

Sequence in context: A175906 A144546 A165970 * A081357 A127708 A094896

Adjacent sequences: A285177 A285178 A285179 * A285181 A285182 A285183

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Apr 14 2017

STATUS

approved