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A184191
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Half the number of (n+1)X4 binary arrays with no 2X2 subblock containing exactly one 1
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1
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60, 561, 5074, 46514, 425802, 3901193, 35741495, 327471410, 3000373034, 27490276713, 251873944520, 2307743577770, 21144231048766, 193729722925587, 1775009260945535, 16263162106133543, 149007922275551447
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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)=14*a(n-1)-45*a(n-2)-18*a(n-3)+249*a(n-4)-239*a(n-5)-128*a(n-6)+184*a(n-7)+10*a(n-8)-20*a(n-9)-2*a(n-10)
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EXAMPLE
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Some solutions for 3X4
..0..1..0..1....1..1..1..0....0..1..0..1....0..1..1..1....0..1..1..0
..1..1..0..1....1..1..1..0....1..0..1..1....1..0..1..1....1..1..1..1
..0..1..1..1....1..0..1..0....0..1..1..0....0..1..0..0....1..1..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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