A222718 - OEIS

A222718

Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order

0, 6, 30, 666, 6524, 103378, 1250904, 17976376, 235892592, 3296371800, 44713314784, 621198984864, 8554092568512, 118954438125472, 1651089670102400, 23021868920182656, 321109217833684736, 4490028930013194112

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Column 2 of A222722

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..209

EXAMPLE

Some solutions for n=3

..0..1....0..1....0..0....0..1....0..1....0..1....0..1....0..0....0..1....0..1

..2..1....2..3....1..0....1..1....0..2....0..0....1..1....0..1....1..1....2..2

..1..3....2..2....2..1....2..3....0..3....1..2....2..0....2..0....0..2....1..2