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A147025
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-01000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 15, 21, 45, 77, 273, 569, 2606, 6661, 31883, 89951, 535540, 1839325, 13532589, 55467031, 467306429, 2229430591, 22257836225
(list; graph; refs; listen; history; internal format)
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