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A237968
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Number of (n+1)X(2+1) 0..3 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
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1
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1494, 10014, 59014, 357672, 2270776, 14222512, 88114176, 550642732, 3451069630, 21560822458, 134629301012, 841895591970, 5264528244482, 32900378176060, 205627745431856, 1285545369352008, 8036253217579508, 50230256232200120
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OFFSET
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1,1
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COMMENTS
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Column 2 of A237974
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 84*a(n-3) +773*a(n-4) +1372*a(n-5) +3600*a(n-6) -8931*a(n-7) -55854*a(n-8) -94782*a(n-9) -31846*a(n-10) +191731*a(n-11) +369506*a(n-12) +355656*a(n-13) +149556*a(n-14) +448480*a(n-15) +642040*a(n-16) +99840*a(n-17) for n>20
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EXAMPLE
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Some solutions for n=3
..2..1..0....1..1..0....0..3..0....0..2..1....3..1..2....3..2..0....1..1..0
..1..2..1....1..3..2....1..2..3....1..0..3....0..1..2....2..3..1....2..3..1
..1..1..2....0..2..3....0..1..0....2..3..2....0..0..0....0..1..1....3..0..2
..2..3..3....0..1..0....2..3..1....3..1..1....3..1..0....1..2..2....2..1..0
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CROSSREFS
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Sequence in context: A137705 A171617 A067841 * A062912 A328975 A345527
Adjacent sequences: A237965 A237966 A237967 * A237969 A237970 A237971
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Feb 16 2014
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STATUS
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approved
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