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A141482
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Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 1 one in any 2 X 2 subblock.
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1
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1, 2, 1, 11, 8, 269, 85, 16334, 5933, 4005785, 817280, 2758179839, 505375405, 6795928721858, 826573277157, 51247532773412135, 4982395765808506, 1302848440978689378895, 90454037365096154821
(list; graph; refs; listen; history; internal format)
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