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A146908
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
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0
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1, 1, 1, 3, 1, 3, 5, 21, 49, 187, 409, 2325, 6489, 55121, 197983, 2161765, 11768363, 152495079, 1086067425, 18675930957, 164918184657, 3873609933855
(list; graph; refs; listen; history; internal format)
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