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A147191
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 11, 21, 45, 95, 317, 775, 2631, 8089, 34521, 128479, 651913, 2804553, 16941209, 86096205, 609652687
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.0.0.1.1
.1.1.0.0.1.1.1.0
.0.1.0.1.1.0.0.0
.0.1.1.0.0.1.0.0
.0.0.1.0.0.1.1.0
.0.0.0.1.1.0.1.0
.0.1.1.1.0.0.1.1
.1.1.0.0.0.0.0.1
CROSSREFS
Sequence in context: A317298 A064568 A147073 * A327607 A034185 A184053
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved