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A234754
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Number of (n+1)X(2+1) 0..3 arrays with 2X2 edge jumps all no more than +1 in one of the clockwise or counterclockwise directions or both
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1
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1014, 26642, 646036, 15939010, 392044622, 9648827736, 237446135146, 5843394219306, 143801532689336, 3538850266550630, 87088497253969902, 2143183802626938104, 52742175287648016058, 1297946099417129620238
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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) = 27*a(n-1) -26*a(n-2) -884*a(n-3) +1597*a(n-4) +7345*a(n-5) -14758*a(n-6) -23881*a(n-7) +52625*a(n-8) +29984*a(n-9) -81577*a(n-10) -7015*a(n-11) +51495*a(n-12) -7850*a(n-13) -9139*a(n-14) +1340*a(n-15) +518*a(n-16) -36*a(n-17)
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EXAMPLE
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Some solutions for n=2
..3..2..3....2..1..0....1..2..1....0..2..0....0..1..1....3..2..1....3..1..3
..0..1..2....1..1..1....2..2..1....1..1..1....2..2..3....1..2..3....2..2..2
..1..0..1....1..1..0....3..2..3....0..2..1....0..1..1....0..1..1....3..1..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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