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A184450
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1/36 the number of (n+2)X4 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last
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1
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234, 600, 1591, 4517, 16029, 58413, 216477, 930657, 3947025, 16260821, 75637161, 341430753, 1469964069, 7087591425, 32968435401, 145042964117, 711996798489, 3363303213633, 14962011182037, 74119134136017, 352902194702745
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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)-11*a(n-2)+195*a(n-3)-1134*a(n-4)+2079*a(n-5)-11600*a(n-6)+62796*a(n-7)-115126*a(n-8)+263520*a(n-9)-1204344*a(n-10)+2207964*a(n-11)-2907648*a(n-12)+10219824*a(n-13)-18736344*a(n-14)+17243280*a(n-15)-42140736*a(n-16)+77258016*a(n-17)-55857600*a(n-18)+82301184*a(n-19)-150885504*a(n-20)+92378880*a(n-21)-60466176*a(n-22)+110854656*a(n-23)-60466176*a(n-24)
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EXAMPLE
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Some solutions with a(1,1)=0 for 6X4
..0..0..0..0....0..0..1..2....0..1..0..0....0..0..0..0....0..0..0..0
..0..2..1..0....2..2..1..0....0..2..1..0....2..1..0..2....1..2..0..1
..1..0..2..1....2..2..2..2....0..0..2..0....2..0..1..2....0..2..1..0
..0..0..0..0....0..1..0..2....0..1..0..0....0..0..0..0....2..2..2..2
..0..2..1..0....2..1..2..0....0..1..2..0....0..1..2..0....1..2..0..1
..0..1..2..0....1..1..1..1....2..0..0..2....1..2..0..1....2..1..0..2
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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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