A198701 - OEIS

A198701

Number of n X n 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.

0, 3, 185, 322230, 10239497407, 4285681886701131

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

OFFSET

1,2

LINKS

EXAMPLE

Some solutions with all values 0 to 4 for n=4:

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

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

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

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

CROSSREFS

Diagonal of A198708.

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Oct 29 2011

STATUS

approved