A210270 Half the number of (n+1)X3 0..2 arrays with every 2X2 subblock having two or three distinct clockwise edge differences

273, 5558, 113248, 2307956, 47036870, 958632858, 19537398722, 398181683100, 8115136633050, 165390438528106, 3370737726383882, 68697277333917074, 1400083986498649180, 28534393870466854178, 581544851172163483038

Offset

1,1

Comments

Column 2 of A210276

Links

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

Formula

Empirical: a(n) = 20*a(n-1) +26*a(n-2) -364*a(n-3) -218*a(n-4) +1203*a(n-5) -418*a(n-6) -394*a(n-7) +216*a(n-8) -20*a(n-9)

Example

Some solutions for n=4
..2..0..1....1..0..2....0..0..2....0..0..2....1..2..1....1..1..2....0..0..2
..2..0..2....0..1..1....0..1..1....0..1..1....1..1..1....1..2..2....1..0..1
..1..0..2....0..0..2....1..2..0....0..1..2....1..0..1....1..1..1....2..0..2
..1..2..2....1..0..0....1..2..2....0..0..1....2..1..2....0..1..2....0..2..2
..2..2..1....2..0..1....0..0..1....0..2..2....0..1..2....2..1..2....2..0..2

Crossrefs

Sequence in context: A029567 A028534 A279114 * A351766 A321035 A225702

Adjacent sequences: A210267 A210268 A210269 * A210271 A210272 A210273

Keyword

nonn

Author

R. H. Hardin Mar 19 2012

Status

approved