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A146387
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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 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 4, 7, 18, 33, 62, 229, 826, 2874, 11455, 45319, 227245, 1250786, 7902554, 51293369, 381222454, 3041924174, 28668489843, 286940122325, 3336283386716
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