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A209791 Half the number of (n+1)X4 0..2 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference 1
1380, 49056, 1732554, 61289190, 2167312950, 76648760118, 2710658447034, 95862567834618, 3390172069647198, 119893318115163858, 4240021127786852970, 149948156963937950274, 5302909535051211495570, 187537150802706970729950 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A209796

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 23*a(n-1) +474*a(n-2) -947*a(n-3) -13207*a(n-4) +27207*a(n-5) +14500*a(n-6) -33255*a(n-7) -1722*a(n-8) +5600*a(n-9) +816*a(n-10)

EXAMPLE

Some solutions for n=4

..1..1..0..1....0..1..0..2....2..1..0..2....1..0..2..0....0..2..0..1

..2..2..2..1....2..2..0..1....1..1..2..2....1..0..0..0....2..2..1..1

..1..1..0..0....2..0..0..1....1..0..2..1....2..2..0..1....0..2..1..2

..2..0..0..1....2..1..0..1....0..0..2..0....2..0..0..0....2..2..0..2

..0..0..1..1....1..1..2..2....0..2..2..0....2..0..1..1....2..0..0..1

CROSSREFS

Sequence in context: A204056 A204049 A204048 * A051114 A139667 A031796

Adjacent sequences:  A209788 A209789 A209790 * A209792 A209793 A209794

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2012

STATUS

approved

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Last modified June 19 17:48 EDT 2019. Contains 324222 sequences. (Running on oeis4.)