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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
0, 3, 185, 322230, 10239497407, 4285681886701131
OFFSET
1,2
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.
Sequence in context: A103503 A203562 A371153 * A157561 A157590 A157236
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Oct 29 2011
STATUS
approved