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A180751 Half the number of n X n binary arrays with each element equal to at least two neighbors 0
0, 1, 1, 9, 86, 2986, 205020, 33329847, 11843513563, 9371551715962, 16360949033733903 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Diagonal of A180760

LINKS

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

CROSSREFS

Sequence in context: A015581 A152261 A028339 * A266828 A100814 A055725

Adjacent sequences: A180748 A180749 A180750 * A180752 A180753 A180754

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 20 2010

STATUS

approved

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Last modified January 26 22:13 EST 2023. Contains 359836 sequences. (Running on oeis4.)