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A068472 Number of n X n binary matrices with every 1 having at most 3 adjacent 1's. 0
2, 16, 496, 58640, 26536192, 45851039232, 302758305892480, 7638804476736307712, 736437724731312162567680, 271287639195997221896855543808, 381862430868672544566361613406502912 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..11.

CROSSREFS

No adjacent 1's A006506, one adjacent 1 A067968.

Sequence in context: A012461 A012458 A012171 * A168402 A168406 A140310

Adjacent sequences:  A068469 A068470 A068471 * A068473 A068474 A068475

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 10 2002

STATUS

approved

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Last modified September 19 12:17 EDT 2020. Contains 337178 sequences. (Running on oeis4.)