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A145931
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Number of n X n binary arrays symmetric under 90 degree rotation 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, 4, 7, 22, 31, 166, 409, 2848, 8224, 74341, 301687, 3626272, 18878730, 299451324, 2103168465, 44919780098, 414592933018, 11582335727655, 142171297585053, 5323365939866750, 86576879487536418, 4274960797178964894
(list; graph; refs; listen; history; internal format)
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