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A147073
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 11, 21, 39, 89, 219, 569, 1579, 5069, 17101, 62347, 244493, 1058973, 4994427, 25066841, 137507293, 817420471
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.0.0.0.1
.0.1.0.1.1.1.1.1
.0.1.0.1.0.0.0.0
.0.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.0
.0.0.0.0.1.0.1.0
.1.1.1.1.1.0.1.0
.1.0.0.0.0.0.1.1
CROSSREFS
Sequence in context: A322595 A317298 A064568 * A147191 A327607 A034185
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved