A233685 Number of (n+1)X(2+1) 0..3 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 10, and no two adjacent values equal

108, 548, 2628, 13324, 64756, 327588, 1596200, 8064200, 39342364, 198550888, 969646256, 4888808640, 23897490056, 120377986076, 588951127540, 2964164674456, 14514267629692, 72990785983124, 357684877930284

Offset

1,1

Comments

Column 2 of A233691

Links

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

Formula

Empirical: a(n) = a(n-1) +28*a(n-2) -25*a(n-3) -103*a(n-4) +97*a(n-5) +68*a(n-6) -47*a(n-7) -12*a(n-8) +2*a(n-9)

Example

Some solutions for n=5
..0..2..0....1..0..1....2..1..0....2..0..1....0..1..2....0..1..3....2..0..2
..2..1..2....0..2..3....1..3..2....0..1..3....1..3..1....2..3..2....3..2..3
..0..2..0....1..0..1....0..1..3....2..0..2....0..2..0....0..2..0....2..0..1
..2..3..1....3..2..0....2..0..2....3..1..0....2..3..1....1..3..2....1..2..0
..0..1..2....2..0..1....3..2..1....2..0..2....3..1..0....2..1..3....2..0..1
..2..3..1....3..2..0....2..0..2....0..1..3....2..3..1....0..2..1....3..2..3

Crossrefs

Sequence in context: A255083 A063880 A059436 * A160919 A129027 A288706

Adjacent sequences: A233682 A233683 A233684 * A233686 A233687 A233688

Keyword

nonn

Author

R. H. Hardin, Dec 14 2013

Status

approved