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A144243
Number of n X n binary arrays, symmetric under 90-degree rotation, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise.
0
1, 2, 1, 3, 2, 10, 36, 77, 170, 1539, 2778, 26239, 152082, 1317122, 7797811, 129473317, 857792500, 17986500145, 205469564882
OFFSET
1,2
CROSSREFS
Sequence in context: A352418 A141486 A184344 * A125210 A098434 A375479
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 15 2008
STATUS
approved