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A252473
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T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 8
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9
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570, 716, 716, 1299, 682, 1299, 2380, 813, 813, 2380, 4507, 1463, 1741, 1463, 4507, 8624, 3497, 5367, 5367, 3497, 8624, 17061, 9056, 18175, 22832, 18175, 9056, 17061, 34876, 24331, 62391, 96543, 96543, 62391, 24331, 34876, 71785, 66366, 213791
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OFFSET
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1,1
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COMMENTS
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Table starts
....570....716....1299......2380.......4507........8624........17061
....716....682.....813......1463.......3497........9056........24331
...1299....813....1741......5367......18175.......62391.......213791
...2380...1463....5367.....22832......96543......409090......1741406
...4507...3497...18175.....96543.....504030.....2670237.....14105131
...8624...9056...62391....409090....2670237....17562191....115183323
..17061..24331..213791...1741406...14105131...115183323....937980722
..34876..66366..735125...7424273...74389293...755607698...7634089567
..71785.182232.2535533..31630086..393421203..4967204849..62282795777
.147822.501727.8732005.134638315.2079994072.32613906966.507708323820
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LINKS
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FORMULA
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Empirical for column k:
k=1: [linear recurrence of order 46] for n>55
k=2: [order 16] for n>21
k=3: [order 19] for n>24
k=4: [order 24] for n>28
k=5: [order 44] for n>47
k=6: [order 72] for n>75
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EXAMPLE
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Some solutions for n=4 k=4
..3..3..3..1..3..3....1..3..3..1..3..3....3..1..3..3..3..3....3..3..3..3..1..3
..3..3..3..3..3..3....3..3..3..3..3..3....1..3..3..3..3..1....3..3..3..3..3..1
..3..3..3..3..3..3....3..3..3..3..1..3....3..3..1..3..3..3....1..3..3..3..3..3
..3..1..3..3..3..1....3..3..3..3..3..3....3..3..3..3..1..3....3..3..3..3..1..3
..3..3..3..1..3..3....3..3..3..1..3..3....3..3..3..3..3..3....3..3..3..3..3..3
..1..3..3..3..3..3....1..3..3..3..3..3....1..3..3..3..3..1....3..3..3..3..3..3
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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