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A144056
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Number of n X n binary arrays, symmetric about both diagonal and antidiagonal, 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, 3, 11, 31, 171, 719, 5907, 40576, 574191, 6118805, 134458817, 2328856652, 81657178991, 2239533631682, 126154274091928, 5530047112752039, 494646201440552586, 34629959352847199652, 4953721399562434015229
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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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