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A221423 Number of 5 X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two. 0
0, 32, 0, 13794, 0, 5501288, 0, 2238166260, 0, 896266172750, 0, 356943936626267, 0, 141932444866235538, 0, 56407987494575281915, 0, 22414489809013612468416, 0, 8906243419860155512004653 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Some solutions for n=4

..2..0..0..2....2..0..0..2....2..0..2..0....0..2..0..2....2..0..2..0

..0..2..2..2....2..0..0..2....2..2..2..0....2..0..0..2....2..0..0..2

..0..2..2..0....2..2..0..0....0..2..2..0....2..0..0..2....2..0..0..0

..0..0..0..2....0..2..2..2....0..0..2..0....2..0..0..0....2..2..2..0

..2..0..0..2....0..0..2..0....2..0..0..2....2..0..2..2....2..0..0..2

CROSSREFS

Row 5 of A221419.

Sequence in context: A240253 A057376 A079312 * A062543 A086820 A174923

Adjacent sequences:  A221420 A221421 A221422 * A221424 A221425 A221426

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 15 2013

STATUS

approved

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Last modified January 28 06:29 EST 2020. Contains 331317 sequences. (Running on oeis4.)