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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
0
15, 18, 130, 527, 5374, 58167, 687222, 11377192, 157746714, 2877417604, 41716355254, 762816679067, 11260740512076, 204256746622744, 3052246394940308
OFFSET
1,1
COMMENTS
Row 4 of A222679
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 28 2013
STATUS
approved