A230828 Number of nX5 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero.

0, 16, 38, 176, 898, 4350, 22852, 122740, 661598, 3593650, 19572998, 106801924, 583264796, 3186690816, 17414382012, 95176462582, 520213927428, 2843500943294, 15543058517272, 84962392690912, 464431030442718, 2538739709562252

Offset

1,2

Comments

Column 5 of A230831

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..0..1..3..1..0....0..3..0..3..0....0..3..2..0..2....0..3..2..0..1
..3..2..0..2..3....1..2..1..2..1....1..0..1..3..1....1..0..1..3..2
..0..1..3..1..0....0..3..0..3..2....2..3..2..0..3....2..3..2..1..0
..3..2..0..2..3....2..1..2..0..1....0..1..3..1..2....1..0..3..2..3

Crossrefs

Sequence in context: A166112 A224738 A304014 * A122030 A122029 A218900

Adjacent sequences: A230825 A230826 A230827 * A230829 A230830 A230831

Keyword

nonn

Author

R. H. Hardin, Oct 30 2013

Status

approved