A198149 - OEIS

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A198149

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

1, 7, 54, 2093, 260917, 108428600, 147146211014, 642756367398421

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

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

Diagonal of A198155

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions containing all values 0 to 4 for n=4

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

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

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

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

CROSSREFS

Sequence in context: A289865 A182124 A303889 * A203878 A043077 A192718

Adjacent sequences: A198146 A198147 A198148 * A198150 A198151 A198152

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 21 2011

STATUS

approved