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A205192 Number of (n+1) X 8 0..1 arrays with the number of clockwise edge increases in every 2 X 2 subblock differing from each horizontal or vertical neighbor. 1
432, 440, 708, 864, 1568, 2048, 3904, 4608, 7872, 9216, 15808, 18944, 32960, 39936, 69824, 84480, 147520, 178176, 310848, 375296, 654656, 790528, 1379136, 1665536, 2905792, 3509248, 6122432, 7393792, 12899520, 15578112, 27178176, 32821760 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A205193.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-2) +a(n-8) for n>13.

Empirical g.f.: 4*x*(108 + 110*x - 39*x^2 - 4*x^3 + 38*x^4 + 80*x^5 + 192*x^6 + 128*x^7 - 92*x^8 - 110*x^9 - 161*x^10 - 88*x^11 - 56*x^12) / (1 - 2*x^2 - x^8). - Colin Barker, Jun 11 2018

EXAMPLE

Some solutions for n=4:

..0..0..1..1..0..0..1..1....1..0..0..1..0..0..1..1....1..0..0..1..1..0..0..1

..1..1..0..0..1..1..0..0....0..1..1..0..0..0..1..1....0..1..1..0..0..1..1..0

..1..1..0..0..1..1..0..0....0..1..1..0..0..1..0..0....1..1..1..0..0..1..1..0

..1..0..1..1..0..0..1..1....1..0..0..1..1..0..0..0....1..1..0..1..1..0..0..1

..0..1..1..1..0..0..1..1....0..0..0..1..1..0..0..1....0..0..1..1..1..0..0..0

CROSSREFS

Cf. A205193.

Sequence in context: A301645 A063463 A175026 * A066419 A245469 A069781

Adjacent sequences:  A205189 A205190 A205191 * A205193 A205194 A205195

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 23 2012

STATUS

approved

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Last modified May 28 04:00 EDT 2020. Contains 334671 sequences. (Running on oeis4.)