A208440 Number of nX3 0..2 arrays with no element equal the average of immediate neighbors vertically above and horizontally left of it

12, 134, 1548, 17992, 209542, 2440104, 28421906, 331022604, 3855542052, 44905676830, 523026174520, 6091752735350, 70951709409564, 826385215602400, 9625043438830750, 112104385765338376, 1305697709338151066

Offset

1,1

Comments

Column 3 of A208445

Links

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

Formula

Empirical: a(n) = 8*a(n-1) +50*a(n-2) -117*a(n-3) +429*a(n-4) -1094*a(n-5) +1139*a(n-6) -1687*a(n-7) +1036*a(n-8) -1068*a(n-9) +144*a(n-10) -64*a(n-11) -128*a(n-12)

Example

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

Crossrefs

Sequence in context: A015469 A144785 A214994 * A218762 A199233 A085938

Adjacent sequences: A208437 A208438 A208439 * A208441 A208442 A208443

Keyword

nonn

Author

R. H. Hardin Feb 26 2012

Status

approved