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A146131
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 5, 9, 21, 39, 159, 427, 2501, 9027, 58503, 271185, 2371669, 14600987, 167228191, 1344019107, 19775648697, 206847230557, 3987249030381, 54541478154327, 1370106516904685, 24431476697291095
(list; graph; refs; listen; history; internal format)
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