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A222741 Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
0, 6, 20, 685, 5370, 123410, 1341616, 25106526, 321557310, 5447475968, 76079350800, 1228204709225, 17971182592538, 283558808435910, 4256630623481552, 66474347415079345, 1012439882213494794 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A222747

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A280039 A216912 A175671 * A069257 A133885 A170867

Adjacent sequences:  A222738 A222739 A222740 * A222742 A222743 A222744

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 04 2013

STATUS

approved

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Last modified February 18 21:20 EST 2020. Contains 332028 sequences. (Running on oeis4.)