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A251843
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Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime
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1
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1951, 5438, 21748, 48692, 277125, 1226031, 2726048, 16168331, 74290304, 163730464, 998856517, 4693337366, 10286321048, 63845445267, 303868751600, 663861257682, 4160750200373, 19942932871102, 43493338467394
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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: a(n) = 123*a(n-3) -4692*a(n-6) +69631*a(n-9) -514311*a(n-12) +2250027*a(n-15) -6529710*a(n-18) +13126892*a(n-21) -18315243*a(n-24) +17438687*a(n-27) -11035045*a(n-30) +4492984*a(n-33) -1153262*a(n-36) +193456*a(n-39) -19536*a(n-42) for n>50
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EXAMPLE
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Some solutions for n=4
..1..1..2..1..1..2..1..1....1..1..2..1..1..2..1..1....3..0..1..0..0..1..0..3
..0..0..1..0..0..1..0..0....0..0..1..0..0..1..0..0....1..1..2..1..1..2..1..1
..0..3..1..0..0..1..0..0....3..0..1..0..0..1..0..3....0..3..1..0..0..1..0..0
..1..1..2..1..1..2..1..1....1..1..2..1..1..2..1..1....0..0..1..3..0..1..0..3
..0..0..1..0..0..1..0..3....0..0..1..0..0..1..0..0....1..1..2..1..1..2..1..1
..0..0..1..3..0..1..3..0....3..0..1..0..0..1..0..0....3..0..1..0..0..1..0..0
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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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