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A205189 Number of (n+1) X 5 0..1 arrays with the number of clockwise edge increases in every 2 X 2 subblock differing from each horizontal or vertical neighbor. 1
72, 104, 160, 256, 384, 576, 864, 1312, 1984, 3008, 4544, 6880, 10400, 15744, 23808, 36032, 54496, 82464, 124736, 188736, 285504, 431968, 653472, 988672, 1495680, 2262848, 3423328, 5179168, 7835328, 11854016, 17933504, 27131360, 41046176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A205193.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) -a(n-3) +a(n-4) for n>6.

Empirical g.f.: 8*x*(9 + 4*x - 2*x^2 + 8*x^3 - x^5) / (1 - x - x^2 + x^3 - x^4). - Colin Barker, Jun 11 2018

EXAMPLE

Some solutions for n=4:

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

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

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

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

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

CROSSREFS

Cf. A205193.

Sequence in context: A099943 A118218 A242186 * A258695 A102562 A216426

Adjacent sequences:  A205186 A205187 A205188 * A205190 A205191 A205192

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 23 2012

STATUS

approved

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Last modified January 21 22:08 EST 2022. Contains 350480 sequences. (Running on oeis4.)