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A217269
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Number of n X 4 arrays of occupancy after each element moves to some horizontal or vertical neighbor.
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1
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4, 441, 33856, 2572816, 194881600, 14755689729, 1117092569476, 84567501131481, 6401965110822961, 484642857129680209, 36688499987102073289, 2777397165745966328049, 210254833741528740686404
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OFFSET
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1,1
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COMMENTS
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Column 4 of A217273.
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..38
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FORMULA
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Empirical: a(n) = 102*a(n-1) -2037*a(n-2) +2098*a(n-3) +111987*a(n-4) -459828*a(n-5) -54016*a(n-6) +1828299*a(n-7) -2079066*a(n-8) +455875*a(n-9) +352710*a(n-10) -165978*a(n-11) +15218*a(n-12) +1308*a(n-13) -111*a(n-14) +a(n-15).
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EXAMPLE
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Some solutions for n=3
..0..1..0..0....1..1..0..2....1..3..1..1....1..0..0..1....1..2..2..1
..1..1..3..2....1..1..2..1....0..2..1..0....1..2..0..3....2..0..0..1
..2..0..1..1....2..0..1..0....0..1..2..0....0..3..0..1....2..0..0..1
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CROSSREFS
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Cf. A217273.
Sequence in context: A125760 A053780 A159514 * A034985 A262102 A104690
Adjacent sequences: A217266 A217267 A217268 * A217270 A217271 A217272
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Sep 29 2012
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STATUS
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approved
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