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A233879
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Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock having the sum of the squares of all six edge and diagonal differences equal to 11
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1
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760, 5156, 33656, 251532, 1768660, 14111768, 103547288, 858513368, 6440961128, 54554580804, 413974622656, 3548715192184, 27091433272416, 233867231401352, 1791402389131776, 15529726061076424, 119191486778549872
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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) = 10*a(n-1) +111*a(n-2) -1347*a(n-3) -2952*a(n-4) +61962*a(n-5) -23589*a(n-6) -1303743*a(n-7) +2061738*a(n-8) +13676265*a(n-9) -32627870*a(n-10) -74205472*a(n-11) +248050297*a(n-12) +184715702*a(n-13) -1058894761*a(n-14) +18879451*a(n-15) +2642739884*a(n-16) -1291495298*a(n-17) -3771977707*a(n-18) +3244720225*a(n-19) +2774675096*a(n-20) -3693043205*a(n-21) -677649206*a(n-22) +2114258648*a(n-23) -285661000*a(n-24) -570117698*a(n-25) +190279800*a(n-26) +48545460*a(n-27) -28512000*a(n-28) +2851200*a(n-29)
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EXAMPLE
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Some solutions for n=3
..0..2..0..2..0....2..2..1..2..1....2..0..1..2..1....1..0..1..2..1
..2..1..0..1..0....1..0..0..2..0....1..0..2..0..0....2..0..2..0..0
..0..2..0..2..0....2..2..1..2..1....2..0..1..2..1....2..1..0..1..2
..1..0..1..2..1....1..0..2..0..2....1..2..2..0..2....2..0..2..0..2
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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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