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A283643
The number of n X n real {0,1}-matrices the square of which is the all-ones matrix.
1
1, 0, 0, 12, 0, 0, 0, 0, 1330560, 0, 0, 0, 0, 0, 0
OFFSET
1,4
COMMENTS
See A283627 for much more information.
CROSSREFS
The main entry for this problem is A283627.
Sequence in context: A101364 A216809 A204274 * A360221 A271437 A271517
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 12 2017
STATUS
approved