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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 1
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

CROSSREFS

Sequence in context: A075591 A130075 A066388 * A200894 A202861 A088256

Adjacent sequences:  A222715 A222716 A222717 * A222719 A222720 A222721

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 03 2013

STATUS

approved

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Last modified August 20 07:48 EDT 2019. Contains 326143 sequences. (Running on oeis4.)