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A221422
Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two
1
0, 16, 150, 1766, 17792, 193809, 2026142, 21225843, 221800513, 2315560756, 24158793461, 251974356335, 2627599071035, 27398017417265, 285664044010997, 2978372739958617, 31052414113756762, 323748492991437021
OFFSET
1,2
COMMENTS
Row 4 of A221419
LINKS
EXAMPLE
Some solutions for n=3
..2..0..2....2..0..2....0..2..0....2..0..2....0..2..0....2..0..0....2..2..0
..0..2..0....0..2..0....2..2..2....0..2..0....2..0..0....2..2..2....0..0..2
..0..2..0....0..2..2....0..2..0....2..0..0....2..2..0....0..0..2....2..2..0
..0..2..2....0..0..2....0..2..0....0..2..2....2..0..2....0..2..0....0..0..2
CROSSREFS
Sequence in context: A000486 A223069 A006420 * A049351 A240424 A341391
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2013
STATUS
approved