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A146001
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 3X3 plus 2,1 2,2 2,3 1,2 3,2.
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0
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1, 1, 2, 1, 4, 3, 13, 10, 51, 49, 310, 338, 2482, 3185, 28263, 43203, 449926, 801916, 9914815, 21045123, 308205077, 768844389, 13283687618, 39245465846, 803638667971, 2803939636958, 67770861551303, 279412729196042
(list; graph; refs; listen; history; internal format)
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