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A186897
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Number of (n+1)X5 binary arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants
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1
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234, 406, 1692, 5401, 14437, 49303, 171877, 608194, 1974583, 6828851, 23697904, 82511604, 280821141, 969113166, 3356595204, 11627225657, 40028089405, 138218574688, 478039503452, 1653233404522, 5707628406749, 19717537044734
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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)=2*a(n-1)+4*a(n-2)+a(n-3)+55*a(n-4)-71*a(n-5)-270*a(n-6)-75*a(n-7)-541*a(n-8)+92*a(n-9)+3469*a(n-10)+2523*a(n-11)-1411*a(n-12)+2361*a(n-13)-3307*a(n-14)-5191*a(n-15)+46033*a(n-16)+47267*a(n-17)-24164*a(n-18)-25983*a(n-19)-130840*a(n-20)-344285*a(n-21)-394773*a(n-22)-421021*a(n-23)-365160*a(n-24)-79912*a(n-25)-75973*a(n-26)-81330*a(n-27)+49938*a(n-28)-268895*a(n-29)-35251*a(n-30)-11215*a(n-31)-844391*a(n-32)-825334*a(n-33)-963512*a(n-34)-938042*a(n-35)+244059*a(n-36)+455064*a(n-37)+214925*a(n-38)+142856*a(n-39)-242661*a(n-40)-340438*a(n-41)-154625*a(n-42)+10260*a(n-43)+74203*a(n-44)+100145*a(n-45)+49482*a(n-46)+8674*a(n-47)+9592*a(n-48)+3430*a(n-49)-305*a(n-50)+1258*a(n-51)+598*a(n-52)-100*a(n-53)-77*a(n-54)-21*a(n-55)-4*a(n-56) for n>62
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EXAMPLE
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Some solutions for 3X5
..0..1..0..0..1....0..1..1..0..0....0..1..0..0..1....1..1..1..1..0
..0..1..1..0..1....0..0..1..1..1....1..1..1..0..1....0..0..0..1..1
..0..0..1..0..0....0..0..0..0..0....1..0..1..0..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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