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A146680
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 9, 20, 33, 56, 137, 404, 1209, 4087, 15733, 60343, 254309, 1153606, 5642466, 31006709, 182836767, 1183007758, 8378875432, 64857203324
(list; graph; refs; listen; history; internal format)
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