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A203651
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1/25 the number of (n+1)X4 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements
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1
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729, 28057, 1116249, 44577561, 1780968921, 71156938905, 2843024036697, 113591039131161, 4538450923550937, 181330649884558233, 7244939996157320793, 289466538539290446105, 11565434217440894223321, 462088880162456091840153
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OFFSET
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1,1
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COMMENTS
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Column 3 of A203656
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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) = 45*a(n-1) -204*a(n-2) +96*a(n-3)
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EXAMPLE
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Some solutions for n=4
..4..1..0..1....2..0..1..4....3..0..4..4....4..3..4..4....2..4..3..3
..1..0..4..0....3..2..0..1....2..3..0..4....0..4..0..4....2..2..4..3
..3..1..0..4....0..3..2..0....4..2..3..0....0..0..1..0....1..2..2..4
..0..3..1..0....1..0..3..2....0..4..2..3....2..0..0..4....2..2..2..2
..0..0..3..1....4..1..0..3....0..0..4..2....2..2..0..0....4..2..1..2
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CROSSREFS
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Sequence in context: A016758 A183809 A224004 * A036536 A223281 A224357
Adjacent sequences: A203648 A203649 A203650 * A203652 A203653 A203654
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 04 2012
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STATUS
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approved
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