A222719 Number of nX3 0..3 arrays with exactly floor(nX3/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order

0, 30, 1683, 88552, 2807505, 173596622, 5700425842, 361481561727, 11854580368227, 768495821905378, 25268983469852703, 1660963025457136586, 54720903080516442190, 3632596805120259336310, 119870557565384807413087

Offset

1,2

Comments

Column 3 of A222722

Links

R. H. Hardin, Table of n, a(n) for n = 1..67

Example

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

Crossrefs

Sequence in context: A103917 A196464 A280360 * A089550 A007804 A295588

Adjacent sequences: A222716 A222717 A222718 * A222720 A222721 A222722

Keyword

nonn

Author

R. H. Hardin Mar 03 2013

Status

approved