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A252295
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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 2 3 6 or 7
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2
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943, 856, 856, 976, 436, 976, 1481, 637, 637, 1481, 2079, 1327, 1663, 1327, 2079, 3265, 3267, 5257, 5257, 3267, 3265, 5676, 8740, 18047, 22766, 18047, 8740, 5676, 10939, 24071, 62277, 96481, 96481, 62277, 24071, 10939, 21842, 66114, 213689, 409028
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OFFSET
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1,1
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COMMENTS
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Table starts
...943....856.....976......1481.......2079........3265.........5676
...856....436.....637......1327.......3267........8740........24071
...976....637....1663......5257......18047.......62277.......213689
..1481...1327....5257.....22766......96481......409028......1741344
..2079...3267...18047.....96481.....503968.....2670175.....14105069
..3265...8740...62277....409028....2670175....17562129....115183261
..5676..24071..213689...1741344...14105069...115183261....937980660
.10939..66114..735011...7424211...74389231...755607636...7634089505
.21842.181896.2535415..31630024..393421141..4967204787..62282795715
.45450.501355.8731891.134638253.2079994010.32613906904.507708323758
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LINKS
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FORMULA
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Empirical for column k:
k=1: [linear recurrence of order 25] for n>30
k=2: [order 9] for n>17
k=3: [order 16] for n>20
k=4: [order 24] for n>27
k=5: [order 44] for n>46
k=6: [order 72] for n>74
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EXAMPLE
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Some solutions for n=4 k=4
..3..2..3..3..3..3....3..3..2..3..3..3....3..2..3..3..3..3....2..3..3..3..2..3
..2..3..3..3..3..2....3..3..3..3..3..3....3..3..3..2..3..3....3..3..3..3..3..2
..3..3..2..3..3..3....3..3..3..3..3..3....2..3..3..3..3..2....3..3..3..3..3..3
..3..3..3..3..3..3....2..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3
..3..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..2..3....2..3..3..3..3..3
..3..3..3..3..2..3....3..3..3..3..3..3....3..2..3..3..3..3....3..2..3..3..2..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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