A197609 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,2,1,1,1 for x=0,1,2,3,4

3, 43, 366, 3569, 33484, 305072, 2851047, 26590627, 247746587, 2305802120, 21459906149, 199841921634, 1861166557518, 17329698018271, 161350468732641, 1502364658567377, 13989296068891906, 130259766181421235

Offset

1,1

Comments

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

Column 4 of A197613

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..2..1....0..1..0..0....2..1..3..1....2..1..3..1....0..0..2..1
..2..1..1..1....1..2..2..1....1..4..1..2....1..4..1..2....0..0..1..0
..1..4..1..2....1..3..1..3....0..1..1..2....3..1..0..0....2..1..4..1
..3..1..0..0....2..1..4..1....0..2..1..1....1..2..0..0....1..3..1..2
..1..2..0..0....0..0..1..2....1..2..1..0....1..2..1..0....0..0..0..0

Crossrefs

Sequence in context: A197778 A321970 A199349 * A199346 A199340 A020461

Adjacent sequences: A197606 A197607 A197608 * A197610 A197611 A197612

Keyword

nonn

Author

R. H. Hardin Oct 16 2011

Status

approved