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A183786
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Half the number of (n+1)X4 0..2 arrays with no 2X2 subblock having sum 4
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1
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1500, 57966, 2214457, 84888699, 3250564943, 124516635830, 4769141272937, 182672398106924, 6996783566736966, 267994941652776449, 10264877718803117731, 393170860146828537991, 15059436873638019867688
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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)=17*a(n-1)+889*a(n-2)+67*a(n-3)-114442*a(n-4)+38222*a(n-5)+5710965*a(n-6)-8373409*a(n-7)-114051095*a(n-8)+222632076*a(n-9)+1029783661*a(n-10)-1946743843*a(n-11)-5282620167*a(n-12)+7274521160*a(n-13)+16742640966*a(n-14)-10412461098*a(n-15)-29378741112*a(n-16)-1262180872*a(n-17)+20149053824*a(n-18)+9992725504*a(n-19)+555859968*a(n-20)-154140672*a(n-21)
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EXAMPLE
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Some solutions for 3X4
..2..1..0..1....0..2..0..2....0..1..0..1....0..2..0..0....2..1..1..1
..2..0..0..2....1..2..1..2....0..1..0..1....2..2..1..0....2..2..2..2
..2..2..0..1....0..2..2..0....0..2..0..1....2..1..2..0....1..1..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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