A204297 Number of nX4 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1, and 2 introduced before 3 in row major order

0, 16, 160, 5956, 56104, 1972288, 38262132, 826746944, 19525910056, 432375489440, 9706792686848, 218843084884500, 4924743527802436, 110797467340650548, 2494225116607793984, 56147370697399654912, 1263637381614193741120

Offset

1,2

Comments

Column 4 of A204301

Links

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

Example

Some solutions for n=5
..2..1..1..0....1..0..0..1....1..1..1..2....1..1..0..2....0..1..1..0
..0..0..1..0....1..0..0..1....0..0..0..0....0..0..0..1....0..1..1..0
..1..0..1..2....2..3..0..1....0..0..1..1....1..2..3..1....0..1..2..3
..1..2..1..0....0..1..3..0....1..2..0..1....1..3..0..0....1..3..0..1
..0..0..1..0....0..1..1..0....1..0..0..1....0..0..1..1....1..0..0..1

Crossrefs

Sequence in context: A225591 A197677 A197535 * A000811 A041484 A283687

Adjacent sequences: A204294 A204295 A204296 * A204298 A204299 A204300

Keyword

nonn

Author

R. H. Hardin Jan 14 2012

Status

approved