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A252286
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Number of (n+2)X(1+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4
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1
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564, 1130, 2525, 5910, 14042, 33171, 79607, 192757, 466820, 1139785, 2794089, 6859899, 16916803, 41819189, 103493568, 256675271, 637537134, 1584780098, 3943709283, 9822330752, 24476360165, 61027931196, 152237787148, 379887999122
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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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FORMULA
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Empirical recurrence of order 89 (see link above)
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EXAMPLE
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Some solutions for n=4
..0..2..0....0..0..2....1..2..0....1..2..2....2..2..2....0..2..0....1..1..0
..2..1..0....2..2..2....0..2..0....1..0..2....2..2..2....1..1..1....0..1..2
..1..2..2....1..1..1....1..2..2....1..0..2....1..2..2....1..2..2....2..0..1
..0..2..1....2..2..2....1..2..0....0..2..1....2..2..1....0..0..2....0..1..2
..2..1..0....2..2..2....1..2..0....2..1..0....2..1..0....1..0..1....1..2..2
..1..0..2....1..1..1....0..1..2....0..0..2....1..2..2....1..2..2....2..2..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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