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A147196
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 3, 5, 13, 27, 85, 297, 1599, 7901, 42229, 268975, 2452217, 25491849, 280714479, 3504622659, 56285411319, 1100845720891, 24390611734773, 611823250262071, 18446369972491401
(list; graph; refs; listen; history; internal format)
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