A233101 Number of 4Xn 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 in row major order

36, 515, 13721, 342626, 8714705, 221113913, 5614356176, 142541243171, 3619052592419, 91885574325470, 2332922952059027, 59231586841647287, 1503856400880343784, 38182060827392770301, 969420865460044960745

Offset

1,1

Comments

Row 4 of A233098

Links

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

Formula

Empirical: a(n) = 25*a(n-1) +52*a(n-2) -1084*a(n-3) +16*a(n-4) +9754*a(n-5) -16165*a(n-6) +5229*a(n-7) +5498*a(n-8) -3740*a(n-9) +320*a(n-10) +96*a(n-11) for n>12

Example

Some solutions for n=3
..0..1..3....0..0..0....0..1..1....0..0..1....0..1..1....0..1..0....0..0..1
..0..1..3....1..0..1....3..1..3....2..0..1....1..1..1....3..1..3....2..0..2
..0..1..0....1..1..1....0..2..3....2..3..2....0..0..0....0..1..3....2..2..2
..3..1..3....0..1..0....0..2..0....2..0..2....0..2..2....0..2..3....3..3..3

Crossrefs

Sequence in context: A281371 A090408 A268635 * A183616 A008657 A134289

Adjacent sequences: A233098 A233099 A233100 * A233102 A233103 A233104

Keyword

nonn

Author

R. H. Hardin, Dec 04 2013

Status

approved