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A146238
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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.
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0
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1, 1, 1, 1, 1, 1, 13, 41, 61, 189, 645, 2565, 9811, 68255, 363653, 2795931, 15874613, 158718393, 1217432647, 15841966869, 160951013553, 2781799777913, 35696899329059
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