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A266501
Number of n X n (0,1)matrices such that there is a row and a column with equal sums.
1
1, 2, 12, 500, 63828, 33394572, 68548156212, 562584834624864
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OFFSET
0,2
COMMENTS
The ratio a(n)/2^(n^2) tends to 1 as n grows.
LINKS
Table of n, a(n) for n=0..7.
Mathoverflow,
A partition of the set of all n x n (0,1)matrices
, 2015.
FORMULA
a(n) = 2^(n^2) 
A266500
(n).
CROSSREFS
Sequence in context:
A013173
A013147
A250110
*
A264952
A324790
A050643
Adjacent sequences:
A266498
A266499
A266500
*
A266502
A266503
A266504
KEYWORD
nonn
,
hard
,
more
AUTHOR
Max Alekseyev
, Dec 30 2015
EXTENSIONS
a(6)a(7) from
Hiroaki Yamanouchi
, Dec 31 2015
STATUS
approved
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Last modified February 25 16:38 EST 2024. Contains 370332 sequences. (Running on oeis4.)