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A145956
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.
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0
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1, 1, 1, 1, 1, 3, 7, 13, 37, 103, 343, 1549, 7241, 37919, 236383, 1636125, 13465687, 128312593, 1395150187, 17424865195, 251739719221, 4153202993611, 79756129711801, 1753738354816013, 44633769685103851, 1301658659951823679
(list; graph; refs; listen; history; internal format)
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