A223098 Number of nX2 0..2 arrays with exactly floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

0, 6, 16, 280, 1440, 16352, 111104, 1072512, 8281600, 74866176, 614068224, 5409544192, 45696688128, 398896128000, 3421054959616, 29796895916032, 257698176565248, 2245655567138816, 19520497243914240, 170356407824547840

Offset

1,2

Comments

Column 2 of A223104

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

Crossrefs

Sequence in context: A113561 A347923 A080809 * A290382 A118949 A303213

Adjacent sequences: A223095 A223096 A223097 * A223099 A223100 A223101

Keyword

nonn

Author

R. H. Hardin Mar 14 2013

Status

approved