A230908 Number of nX6 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, no adjacent elements equal, and upper left element zero

0, 272, 2676, 23614, 219696, 2121666, 20713786, 202875672, 1989694528, 19528076278, 191729518620, 1882751038230, 18489720853716, 181586260234680, 1783375832120916, 17514856242872756, 172017407770200164

Offset

1,2

Comments

Column 6 of A230910

Links

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

Example

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

Crossrefs

Sequence in context: A158587 A304417 A316242 * A305952 A317213 A178268

Adjacent sequences: A230905 A230906 A230907 * A230909 A230910 A230911

Keyword

nonn

Author

R. H. Hardin, Nov 01 2013

Status

approved