A197668 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4

5, 71, 546, 5005, 44323, 403960, 3675345, 33272751, 301565202, 2734015025, 24796812073, 224875172500, 2039110071283, 18490725428895, 167679905896100, 1520586052304877, 13789181642921163, 125044668702632018

Offset

1,1

Comments

Every 0 is next to 0 4's, every 1 is next to 1 0's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 1's

Column 4 of A197672

Links

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

Example

Some solutions containing all values 0 to 4 for n=5
..0..0..0..1....0..2..1..0....1..0..1..2....0..2..1..0....0..1..1..0
..0..3..0..1....0..1..4..1....2..1..4..1....0..1..4..1....1..4..1..2
..1..1..0..1....0..2..1..2....0..2..1..0....2..1..1..1....2..1..0..1
..1..4..1..2....3..0..0..0....3..0..2..0....1..0..0..0....0..3..0..1
..0..1..1..0....0..3..0..0....0..0..1..1....1..0..3..0....0..0..0..1

Crossrefs

Sequence in context: A197405 A295536 A197427 * A064752 A033507 A092250

Adjacent sequences: A197665 A197666 A197667 * A197669 A197670 A197671

Keyword

nonn

Author

R. H. Hardin Oct 17 2011

Status

approved