A283643 The number of n X n real {0,1}-matrices the square of which is the all-ones matrix.

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.

Links

Table of n, a(n) for n=1..15.

Crossrefs

The main entry for this problem is A283627.

Sequence in context: A101364 A216809 A204274 * A360221 A271437 A271517

Adjacent sequences: A283640 A283641 A283642 * A283644 A283645 A283646

Keyword

nonn

Author

N. J. A. Sloane, Mar 12 2017

Status

approved