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A254506
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Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of four medians of central row, central column, diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally
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1
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2703, 12324, 68832, 356061, 1731335, 8282251, 38770022, 178707667, 815255701, 3683796336, 16525980573, 73671578242, 326677241389, 1441862858957, 6338127433805, 27761171502804, 121206014851274, 527673136282231
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..0..1..0....0..1..0..0....0..1..1..0....0..0..0..1....0..0..0..0
..0..0..0..0....1..0..0..1....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..0..0....0..1..0..1....0..0..0..1....1..0..0..0
..1..0..0..0....1..0..0..1....0..1..0..1....1..0..0..0....1..0..1..0
..0..1..0..0....1..1..1..1....0..0..0..0....0..0..0..1....0..1..0..1
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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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