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A146931
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-1001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 7, 14, 22, 37, 79, 162, 380, 937, 2496, 7209, 22236, 73304, 252500, 902438, 3477063, 13836097, 60384897, 273397251, 1352635265, 7039542506, 39611966803
(list; graph; refs; listen; history; internal format)
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