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A252638
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Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7
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1
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13038, 56953, 355574, 1848350, 14252070, 101563107, 625096361, 5008257261, 37697432955, 249652077490, 2032261522492, 15635941105030, 106418386308662, 871159195685975, 6754058973564385, 46384957892341034, 380465229747869809
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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) = 856*a(n-3) -242572*a(n-6) +29720906*a(n-9) -1602181457*a(n-12) +35744049414*a(n-15) -617580504991*a(n-18) +7887897442346*a(n-21) -72158427903830*a(n-24) +523158699334442*a(n-27) -2591085325582721*a(n-30) +5595058223175892*a(n-33) +3578963449703396*a(n-36) -28530932892775056*a(n-39) +20891722678397296*a(n-42) +24765258880649920*a(n-45) -28231745865638400*a(n-48) +3200764170240000*a(n-51) for n>63
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EXAMPLE
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Some solutions for n=2
..1..0..3..1..3..3..1..3....3..2..2..3..2..2..0..2....2..3..2..2..3..2..2..0
..2..0..2..2..0..2..2..3....2..3..2..2..3..2..2..0....2..2..3..2..2..3..2..2
..2..2..3..2..2..3..2..2....0..3..1..0..3..1..3..3....1..0..3..1..3..3..1..0
..1..0..3..1..3..3..1..3....0..2..2..3..2..2..3..2....2..3..2..2..3..2..2..3
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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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