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A146592
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 3, 23, 47, 75, 181, 675, 3025, 16403, 71953, 340893, 1986607, 14754733, 121306057, 1066980245, 9641071515, 101852566849, 1271193446821
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