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A140338
Half the number of n X n binary matrices differing in at most three positions between adjacent rows and at most three positions between adjacent columns.
0
1, 8, 256, 23045, 3499498, 540106922, 68719476736
OFFSET
1,2
CROSSREFS
Sequence in context: A374283 A024290 A253165 * A140339 A103488 A341479
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 28 2008
STATUS
approved