A222831 Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order

6, 613, 114782, 23567385, 5026137016, 1093286140097, 240791286159691, 53509887603503644, 11973329684485913722, 2693909098107381431482, 608845475416039463267176, 138122543896575176671661121

Offset

1,1

Comments

Column 4 of A222832

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

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

Crossrefs

Sequence in context: A255886 A300389 A172899 * A206458 A265116 A132928

Adjacent sequences: A222828 A222829 A222830 * A222832 A222833 A222834

Keyword

nonn

Author

R. H. Hardin Mar 06 2013

Status

approved