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A221228 Number of nX4 arrays of occupancy after each element moves to some king-move neighbor, with no occupancy greater than 2 0
4, 1033, 65453, 4581973, 322610120, 23035350108, 1652940878370, 118885924289161, 8558151176825984, 616265885110474351, 44381234970536270542, 3196241880309292793297 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A221229

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=3

..1..1..0..0....2..0..1..2....2..0..0..0....1..0..1..1....1..1..1..2

..2..0..2..1....0..2..0..0....2..1..1..1....2..0..2..0....0..2..0..0

..2..2..1..0....2..1..2..0....2..1..0..2....0..2..2..1....1..0..2..2

CROSSREFS

Sequence in context: A013780 A139300 A004804 * A159859 A110499 A009013

Adjacent sequences: A221225 A221226 A221227 * A221229 A221230 A221231

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 05 2013

STATUS

approved

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Last modified February 6 23:12 EST 2023. Contains 360111 sequences. (Running on oeis4.)