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A145926
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Number of n X n binary arrays symmetric under horizontal reflection 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, 5, 1, 30, 11, 1066, 349, 107926, 18649, 30463506, 4281564, 28469202195, 3104114083, 81975632480940, 6299974483160, 716618459027321854, 40647817503851905, 19639345520014570444862, 820703096331703481460
(list; graph; refs; listen; history; internal format)
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