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A223120
Number of n X 2 0..2 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.
1
1, 10, 72, 664, 5376, 47968, 406400, 3585408, 30987264, 272565760, 2378450944, 20921604096, 183506403328, 1615798558720, 14215745994752, 125323120574464, 1104802314190848, 9750937675890688, 86084069811027968, 760548158573379584
OFFSET
1,2
COMMENTS
Column 2 of A223126.
LINKS
EXAMPLE
Some solutions for n=3
..0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..1..2....1..0....2..0....1..1....2..0....0..0....1..1....0..2....0..1....0..1
..1..2....2..0....2..2....0..1....1..1....2..0....2..1....2..1....0..2....0..0
CROSSREFS
Cf. A223126.
Sequence in context: A155606 A181671 A058111 * A240275 A181402 A003366
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 15 2013
STATUS
approved