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A226321 Number of real {0,1} matrices n X n which are the square of a {0,1} matrix. 2
1, 2, 8, 88, 3245, 254411, 37324414 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A121231(n) >= a(n).

LINKS

Table of n, a(n) for n=0..6.

EXAMPLE

The 8 solutions when n=2 are:

00 00 00 01 10 10 10 11

00 01 11 01 00 01 10 00

- from N. J. A. Sloane, Jun 03 2013

CROSSREFS

Cf. A121231, A225371.

Sequence in context: A009144 A132316 A136749 * A054955 A012299 A012295

Adjacent sequences:  A226318 A226319 A226320 * A226322 A226323 A226324

KEYWORD

nonn,more,hard

AUTHOR

Giovanni Resta, Jun 03 2013

STATUS

approved

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Last modified June 20 17:51 EDT 2019. Contains 324234 sequences. (Running on oeis4.)