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 A221258 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2 1
 0, 64, 112, 58081, 1319409, 103489929, 4085800416, 226720727104, 10445351809532, 530909339760900, 25591483232781872, 1268920553028932644, 61970903049203536750, 3051063081822723807844, 149565983362653741790314 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 4 of A221255 LINKS R. H. Hardin, Table of n, a(n) for n = 1..16 EXAMPLE Some solutions for n=3 ..1..2..1....0..2..0....1..2..0....0..2..1....1..2..0....0..2..1....0..2..0 ..0..2..0....1..2..0....0..2..2....1..2..1....1..2..0....0..2..1....1..2..0 ..0..2..1....2..2..0....0..2..0....0..2..1....0..2..2....1..2..0....1..2..1 ..1..2..0....0..2..1....0..2..1....0..2..0....0..2..0....0..2..1....1..2..0 CROSSREFS Sequence in context: A094682 A118158 A264590 * A195678 A029777 A145464 Adjacent sequences:  A221255 A221256 A221257 * A221259 A221260 A221261 KEYWORD nonn AUTHOR R. H. Hardin Jan 06 2013 STATUS approved

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Last modified September 23 19:48 EDT 2021. Contains 347617 sequences. (Running on oeis4.)