A198208 Number of 2nX8 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors

11029, 1660672, 276030525, 51432469614, 10120087499636

Offset

1,1

Comments

Column 4 of A198209

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A156942 A325311 A164518 * A139409 A233789 A236151

Adjacent sequences: A198205 A198206 A198207 * A198209 A198210 A198211

Keyword

nonn

Author

R. H. Hardin Oct 22 2011

Status

approved