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A147267
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 27, 51, 87, 231, 993, 2999, 11701, 48597, 296399, 1545465, 9380053, 56658941, 454413807
(list; graph; refs; listen; history; internal format)
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