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A145789
Number of n X n binary arrays with all ones connected only either four adjacent vertically or four adjacent horizontally.
0
1, 1, 1, 15, 89, 904, 10469, 202299, 6253788, 295345323, 20297903190, 2062672356086, 313264131593508
OFFSET
1,4
CROSSREFS
Sequence in context: A241433 A220150 A164541 * A010822 A316224 A022707
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 19 2008
STATUS
approved