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A144054
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Number of n X n binary arrays, symmetric under horizontal and vertical 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, 2, 1, 5, 15, 65, 233, 1687, 8512, 96837, 990941, 16983353, 265775404, 7061955223, 183338740300, 7436406032400, 326859686075965, 20333610181788816, 1471382970077109810, 140578109521427255473, 16886941052098865528443
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internal format)
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OFFSET
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1,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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