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A144053
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Number of n X n binary arrays, symmetric under horizontal reflection, with every 1 adjacent to at least one other 1, but at most one 1 adjacent horizontally and at most one 1 adjacent vertically.
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0
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1, 4, 5, 25, 357, 4765, 90553, 3100249, 146194232, 11993787067, 1839157793733, 369768109497405, 136403046959201932, 67251730314890513141, 66275214154448397358578, 79949861700558334494500876
(list; graph; refs; listen; history; internal format)
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