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A222645
Number of nX4 0..2 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order
1
4, 12, 61, 457, 3411, 31487, 317655, 3161392, 31436637, 315944445, 3182997999, 32059374557, 323386403994, 3267568146811, 33053624461081, 334704837151091, 3392894959638835, 34428005433287948, 349661755820884825
OFFSET
1,1
COMMENTS
Column 4 of A222649
LINKS
EXAMPLE
Some solutions for n=3
..0..0..0..1....0..1..1..1....0..1..0..0....0..1..1..1....0..1..1..1
..0..0..0..2....0..1..1..1....2..0..0..0....1..1..1..1....0..1..1..1
..0..0..2..2....1..1..1..1....0..0..0..0....2..1..1..1....2..1..1..1
CROSSREFS
Sequence in context: A097250 A188328 A291772 * A259816 A353452 A071769
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 27 2013
STATUS
approved