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A180761
Half the number of n X n binary arrays with each element equal to at least one neighbor
0
0, 3, 63, 4475, 1154119, 1064583557, 3538520414645, 42325704140613463, 1822180205677117048273, 282344956970612464702333909, 157459613671260527898784781898227
OFFSET
1,2
COMMENTS
Diagonal of A180771
CROSSREFS
Sequence in context: A369955 A123687 A159605 * A156904 A193100 A053857
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 20 2010
STATUS
approved