A223042 Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

2, 8, 98, 1265, 17356, 241583, 3395532, 48048796, 683306658, 9759462283, 139866408792, 2010279482902, 28963821801648, 418182844095108, 6048773850787538, 87632133398349504, 1271377018275506438

Offset

1,1

Comments

Row 2 of A223041

Links

R. H. Hardin, Table of n, a(n) for n = 1..61

Example

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

Crossrefs

Sequence in context: A001697 A006069 A270485 * A052457 A119654 A333439

Adjacent sequences: A223039 A223040 A223041 * A223043 A223044 A223045

Keyword

nonn

Author

R. H. Hardin Mar 12 2013

Status

approved