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A207994
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Number of nX5 0..2 arrays with new values 0..2 introduced in row major order and no element equal to any horizontal or vertical neighbor (colorings ignoring permutations of colors).
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3
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8, 81, 853, 9075, 96831, 1034073, 11045757, 117997043, 1260537911, 13466147569, 143857201093, 1536809621307, 16417559602831, 175386899980873, 1873638094198285, 20015860487662275, 213827138093982759
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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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a(n) = 16*a(n-1) -65*a(n-2) +92*a(n-3) -48*a(n-4) +8*a(n-5).
G.f.: -x*(8-47*x+77*x^2-44*x^3+8*x^4) / ( -1+16*x-65*x^2+92*x^3-48*x^4+8*x^5 ). - R. J. Mathar, Nov 23 2015
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EXAMPLE
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Some solutions for n=4
..0..1..0..2..0....0..1..2..0..1....0..1..0..1..2....0..1..2..1..2
..1..0..2..1..2....2..0..1..2..0....1..2..1..2..1....1..2..0..2..0
..2..1..0..2..0....1..2..0..1..2....2..0..2..0..2....2..0..2..0..1
..0..2..1..0..2....2..0..2..0..1....1..2..1..2..0....1..2..1..2..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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