A222872 Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order

1, 11, 131, 2150, 32491, 533186, 8362152, 135650378, 2155759835, 34780282521, 555913562689, 8947148045345, 143379589806584, 2305060329759954, 36982483115935396, 594232174227590798, 9538759468134692551

Offset

1,2

Comments

Column 2 of A222878

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

Crossrefs

Sequence in context: A061113 A261689 A101334 * A068645 A097258 A044041

Adjacent sequences: A222869 A222870 A222871 * A222873 A222874 A222875

Keyword

nonn

Author

R. H. Hardin Mar 08 2013

Status

approved