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A146186
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 17, 39, 67, 157, 683, 2593, 13101, 70047, 421791, 2622253, 19003451, 153761107, 1499143675, 15781975001, 199989123849, 2755107112873
(list; graph; refs; listen; history; internal format)
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