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A254354
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Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and the central column and the two maximums of the diagonal and antidiagonal nondecreasing horizontally and vertically
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2
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512, 2868, 15051, 72939, 332330, 1451174, 6117882, 25078442, 100521610, 395707664, 1534522207, 5877625474, 22280410745, 83725432325, 312300575832, 1157580371836, 4267575709129, 15660116804124, 57235664688706
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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) = 8*a(n-1) -16*a(n-2) -10*a(n-3) +49*a(n-4) -134*a(n-5) +511*a(n-6) -823*a(n-7) +1122*a(n-8) -1482*a(n-9) +467*a(n-10) +329*a(n-11) -2184*a(n-12) +2463*a(n-13) -1910*a(n-14) +2072*a(n-15) +52*a(n-16) +877*a(n-17) -2244*a(n-18) +480*a(n-19) +3226*a(n-20) -3604*a(n-21) -568*a(n-22) +944*a(n-23) +1272*a(n-24) -1120*a(n-25) +224*a(n-26) for n>27
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EXAMPLE
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Some solutions for n=4
..1..1..0....0..1..1....0..0..0....0..0..0....0..0..0....1..1..0....0..0..0
..1..0..0....0..0..0....0..1..0....0..0..1....0..0..0....0..0..0....0..1..1
..0..0..0....0..1..0....0..0..0....1..1..0....1..1..0....1..1..1....1..0..1
..1..0..1....1..0..0....1..1..0....0..1..1....1..0..1....1..0..0....1..1..0
..0..0..1....0..1..1....1..0..0....1..1..1....1..1..0....1..1..1....1..0..1
..1..0..0....1..0..0....1..1..0....1..0..0....0..1..1....1..0..0....0..1..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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