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A206311 Number of (n+1)X2 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero 1
112, 873, 6831, 53463, 418468, 3275406, 25637095, 200665376, 1570637751, 12293615779, 96223962193, 753159288558, 5895089964664, 46141747460483, 361158332020412, 2826840073596765, 22126098426129671, 173184268942327111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A206318

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +21*a(n-2) +13*a(n-3) -31*a(n-4) -17*a(n-5) +34*a(n-6) +2*a(n-7) -9*a(n-8) -a(n-9)

EXAMPLE

Some solutions for n=4

..2..2....3..0....0..1....3..2....1..1....0..1....3..1....2..0....1..0....2..2

..0..3....2..2....1..3....0..3....3..2....1..2....3..2....1..1....0..1....0..3

..3..0....0..3....2..1....3..0....0..3....0..2....1..3....3..2....1..2....2..1

..0..1....1..0....1..0....1..3....2..0....2..1....3..0....2..1....2..1....1..0

..2..3....2..1....3..1....2..1....0..1....0..3....1..1....3..2....0..2....2..1

CROSSREFS

Sequence in context: A203789 A211448 A206318 * A343372 A330418 A235311

Adjacent sequences:  A206308 A206309 A206310 * A206312 A206313 A206314

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2012

STATUS

approved

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Last modified December 6 04:52 EST 2021. Contains 349562 sequences. (Running on oeis4.)