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A146067
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 5, 9, 17, 41, 117, 275, 1237, 4103, 20885, 85925, 519635, 2644535, 20312399, 128516271, 1266040749, 10025925703, 122157386121, 1211481473503, 18256047371395, 225812595799851, 4272679708033791, 65914771408101775
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OFFSET
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1,8
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.0.0.1.1.1.0.0
.0.0.0.1.0.0.1.1
.0.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.0
.1.1.0.0.1.0.0.0
.0.0.1.1.1.0.0.0
.0.0.1.0.0.0.0.0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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