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A145958
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.
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0
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1, 1, 1, 1, 1, 9, 19, 37, 135, 441, 1879, 9853, 53945, 336895, 2463469, 20551403, 200816385, 2276422523, 29317863291, 437152357559, 7466970790985, 147328291419831, 3346732661121193
(list; graph; refs; listen; history; internal format)
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