A196987 Number of nX6 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,3,4,1,0 for x=0,1,2,3,4

1, 17, 242, 2499, 31791, 389518, 4743311, 58038517, 713190410, 8761030047, 107458130741, 1318534640744, 16183672145693, 198628472994711, 2437691980502762, 29916664089221985, 367160436509970605

Offset

1,2

Comments

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

Column 6 of A196989

Links

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

Example

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

Crossrefs

Sequence in context: A251769 A290340 A103772 * A051560 A259347 A324358

Adjacent sequences: A196984 A196985 A196986 * A196988 A196989 A196990

Keyword

nonn

Author

R. H. Hardin Oct 08 2011

Status

approved