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A146238
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 13, 41, 61, 189, 645, 2565, 9811, 68255, 363653, 2795931, 15874613, 158718393, 1217432647, 15841966869, 160951013553, 2781799777913, 35696899329059
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.0.0.1.1.0.0
.1.1.0.1.1.0.0.0
.1.1.1.0.0.1.0.0
.0.0.1.0.0.1.1.1
.0.0.0.1.1.0.1.1
.0.0.1.1.0.0.0.0
.0.0.1.1.0.0.0.0
CROSSREFS
Sequence in context: A122730 A101167 A334557 * A039339 A031373 A043162
KEYWORD
nonn
AUTHOR
STATUS
approved