A223122 Number of nX4 0..2 arrays with no more than floor(nX4/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

10, 489, 28907, 1780641, 112106293, 7157970340, 461597847603, 29989116614529, 1959625907209239, 128645318481467647, 8477443608456769792, 560422268684443059564, 37148157807866359018565, 2468123723995159036467948

Offset

1,1

Comments

Column 4 of A223126

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

Crossrefs

Sequence in context: A173157 A035320 A200458 * A071096 A039835 A293090

Adjacent sequences: A223119 A223120 A223121 * A223123 A223124 A223125

Keyword

nonn

Author

R. H. Hardin Mar 15 2013

Status

approved