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A147465
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-0011 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 7, 19, 33, 57, 137, 389, 1061, 3337, 12013, 46721, 194071, 871607, 4080549, 21286795, 118904521, 740082723, 4935470201, 36634269329
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