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A146877
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 13, 37, 65, 121, 421, 1309, 3649, 15177, 81237, 474405, 2569641, 13240801, 84039101, 586237485
(list; graph; refs; listen; history; internal format)
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