A222682 Number of 4Xn 0..3 arrays with no more than floor(4Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

15, 18, 130, 527, 5374, 58167, 687222, 11377192, 157746714, 2877417604, 41716355254, 762816679067, 11260740512076, 204256746622744, 3052246394940308

Offset

1,1

Comments

Row 4 of A222679

Links

Table of n, a(n) for n=1..15.

Example

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

Crossrefs

Sequence in context: A354818 A274979 A083823 * A220787 A167322 A217406

Adjacent sequences: A222679 A222680 A222681 * A222683 A222684 A222685

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved