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A146677
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Number of n X n binary arrays symmetric about main diagonal 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, 3, 9, 19, 52, 193, 866, 4709, 29160, 204475, 1745781, 17973283, 218163477, 3154013451, 54291505832, 1101846202608, 26444293196609, 754399567634635, 25615826491870630, 1034470468747498026
(list; graph; refs; listen; history; internal format)
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