A222685 Number of nX3 0..2 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

0, 4, 32, 420, 2050, 32296, 159672, 2593768, 13108760, 215573760, 1103125848, 18291819408, 94349236032, 1574003841792, 8162910172992, 136816063935552, 712336725800320, 11983316167337728, 62579289627023616, 1055874509971768576

Offset

1,2

Comments

Column 3 of A222690

Links

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

Example

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

Crossrefs

Sequence in context: A229548 A005172 A298694 * A322735 A140178 A366685

Adjacent sequences: A222682 A222683 A222684 * A222686 A222687 A222688

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved