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A233812
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Number of (n+1)X(2+1) 0..5 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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428, 2216, 10972, 59164, 301132, 1671748, 8669484, 49193332, 258472076, 1489731188, 7897386348, 46003922580, 245314826316, 1439035206612, 7702769372076, 45388322272500, 243536496830348, 1439109535539508
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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) = 5*a(n-1) +74*a(n-2) -386*a(n-3) -1919*a(n-4) +10855*a(n-5) +21122*a(n-6) -141906*a(n-7) -86736*a(n-8) +918488*a(n-9) -46708*a(n-10) -2918256*a(n-11) +1088816*a(n-12) +4381664*a(n-13) -2361152*a(n-14) -2591360*a(n-15) +1642176*a(n-16) +224256*a(n-17) -168192*a(n-18)
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EXAMPLE
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Some solutions for n=4
..5..5..3....3..1..3....5..4..2....4..2..4....5..4..2....2..1..0....3..2..3
..3..4..5....2..1..2....3..3..2....2..3..2....5..3..2....0..0..2....4..4..2
..5..5..3....0..0..2....1..2..4....2..4..2....4..3..1....2..1..2....2..3..2
..3..4..3....1..2..1....1..3..4....3..4..3....2..2..3....3..3..3....3..1..3
..2..2..4....3..3..3....1..2..2....2..2..2....4..3..1....5..4..5....1..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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