A222839 Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order

1, 8, 105, 1585, 23107, 353631, 5338646, 81874696, 1252153841, 19270376854, 296641979113, 4580055753005, 70780702170260, 1095722113681548, 16978656325074532, 263390892198118920, 4089414898741050209

Offset

1,2

Comments

Column 2 of A222842

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

Crossrefs

Sequence in context: A239400 A001922 A264014 * A113551 A082735 A024358

Adjacent sequences: A222836 A222837 A222838 * A222840 A222841 A222842

Keyword

nonn

Author

R. H. Hardin Mar 06 2013

Status

approved