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

1,2

COMMENTS

Row 4 of A221419

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..33

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

Adjacent sequences:  A221419 A221420 A221421 * A221423 A221424 A221425

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2013

STATUS

approved

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Last modified August 12 00:34 EDT 2022. Contains 356067 sequences. (Running on oeis4.)