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A145929
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.
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0
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1, 1, 1, 1, 2, 3, 8, 13, 44, 111, 556, 1606, 9677, 40103, 359014, 1871694, 20359902, 143317291, 2226693360, 20614186256, 404517634279, 4951846403553, 133436650402934, 2175520025174634, 76183950538555436, 1636466403191913572
(list; graph; refs; listen; history; internal format)
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