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A254769
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Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the central row and the central column and the two medians of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally
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1
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2630, 11321, 55196, 250996, 1124228, 5140919, 23633202, 108849819, 502702408, 2323558628, 10742654676, 49672088300, 229690275939, 1062108485208, 4911279320298, 22710204623110, 105013833732614, 485591628870469
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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) = 6*a(n-1) -3*a(n-2) -6*a(n-3) -43*a(n-4) -77*a(n-5) +309*a(n-6) +116*a(n-7) +44*a(n-8) -130*a(n-9) -1557*a(n-10) -155*a(n-11) +535*a(n-12) +1646*a(n-13) +2223*a(n-14) -269*a(n-15) -483*a(n-16) -3009*a(n-17) +629*a(n-18) -994*a(n-19) -3413*a(n-20) +174*a(n-21) -3872*a(n-22) +6126*a(n-23) +7436*a(n-24) +4876*a(n-25) +5215*a(n-26) -11663*a(n-27) -4317*a(n-28) -6159*a(n-29) -7246*a(n-30) +12175*a(n-31) -2813*a(n-32) +8505*a(n-33) +4164*a(n-34) -4343*a(n-35) +1956*a(n-36) -15945*a(n-37) +4437*a(n-38) -5638*a(n-39) +10900*a(n-40) +13881*a(n-41) -5488*a(n-42) +6329*a(n-43) -18530*a(n-44) -1325*a(n-45) -475*a(n-46) -1024*a(n-47) +10773*a(n-48) -3387*a(n-49) +2336*a(n-50) -1038*a(n-51) -2044*a(n-52) +944*a(n-53) -672*a(n-54) +384*a(n-55) for n>65
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EXAMPLE
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Some solutions for n=3
..0..1..1..1....1..1..0..0....0..0..1..1....1..1..1..0....1..0..0..1
..1..0..0..1....0..0..0..0....1..0..1..0....0..1..1..0....0..1..0..0
..0..0..1..0....1..0..0..1....0..1..1..1....0..1..1..1....0..1..1..1
..0..1..1..0....0..1..1..1....0..1..1..1....1..1..1..1....1..1..1..0
..0..1..0..1....0..1..1..0....1..1..1..1....1..1..1..0....1..0..1..0
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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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