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A202935
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Number of (n+3) X 7 binary arrays with consecutive windows of four bits considered as a binary number nondecreasing in every row and column.
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1
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130321, 206145, 330853, 533832, 857408, 1360328, 2121734, 3245653, 4866027, 7152307, 10315635, 14615638, 20367858, 27951842, 37819916, 50506667, 66639157, 86947893, 112278577, 143604660, 182040724, 228856716, 285493058, 353576657
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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) = (1/210)*n^7 + (11/20)*n^6 + (81/5)*n^5 + (1713/8)*n^4 + (90179/60)*n^3 + (337713/40)*n^2 + (15214631/420)*n + 83919.
G.f.: x*(130321 - 836423*x + 2330681*x^2 - 3638908*x^3 + 3428986*x^4 - 1947234*x^5 + 616520*x^6 - 83919*x^7) / (1 - x)^8.
a(n) = 8*a(n-1) - 28*a(n-2) + 56*a(n-3) - 70*a(n-4) + 56*a(n-5) - 28*a(n-6) + 8*a(n-7) - a(n-8) for n>8.
(End)
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EXAMPLE
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Some solutions for n=1:
..0..0..0..0..1..1..1....0..0..0..1..0..0..0....0..0..0..1..1..0..1
..0..0..0..1..0..0..0....0..0..0..0..1..0..1....0..0..0..1..1..0..0
..0..0..0..0..0..0..1....0..0..0..1..0..0..0....0..0..0..1..0..1..1
..0..0..1..1..1..1..1....0..1..1..1..1..1..1....0..0..0..0..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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