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A147403
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 9, 25, 37, 81, 207, 659, 1525, 5011, 16955, 78955, 307577, 1539617, 6559267, 39653567, 197073411, 1351045655
(list; graph; refs; listen; history; internal format)
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