A222720 Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order

6, 666, 88552, 12956013, 1928517786, 289452236157, 43727219083464, 6642633038715993, 1013931851324206903, 155405622159690335817, 23903771940011196629121, 3688080815279058966399672

Offset

1,1

Comments

Column 4 of A222722

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

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

Crossrefs

Sequence in context: A220858 A337652 A222743 * A309597 A269842 A333639

Adjacent sequences: A222717 A222718 A222719 * A222721 A222722 A222723

Keyword

nonn

Author

R. H. Hardin Mar 03 2013

Status

approved