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A068471 Number of n X n binary matrices with each 1 having at most 2 adjacent 1's. 1
2, 16, 378, 30824, 8402216, 7664347268, 23371379782671, 238225926162821893, 8118262028301675826132, 924887563235974860108746534, 352261845112790535941917078458268 (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: A009341 A015201 A227406 * A325287 A140308 A280723

Adjacent sequences:  A068468 A068469 A068470 * A068472 A068473 A068474

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 10 2002

STATUS

approved

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Last modified December 1 09:26 EST 2021. Contains 349426 sequences. (Running on oeis4.)