A222721 Number of nX5 0..3 arrays with exactly floor(nX5/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order

20, 6524, 2807505, 1928517786, 662075303107, 474459483232672, 159780846921127290, 118321716926292008569

Offset

1,1

Comments

Column 5 of A222722

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A123379 A175015 A135292 * A223051 A222744 A234459

Adjacent sequences: A222718 A222719 A222720 * A222722 A222723 A222724

Keyword

nonn

Author

R. H. Hardin Mar 03 2013

Status

approved