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 A221823 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without consecutive moves in the same direction 1
 13, 2113, 190756, 18636989, 1804472268, 174820457922, 16936005698353, 1640717334488903, 158947987755078035, 15398437448141904936, 1491757378064714004413, 144517269678468770214198 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A221824 LINKS R. H. Hardin, Table of n, a(n) for n = 1..25 EXAMPLE Some solutions for n=3 ..0..1..0..2....1..0..1..1....0..1..0..1....0..3..0..0....0..0..2..0 ..1..4..0..0....2..3..2..0....1..2..0..4....1..1..1..2....2..0..4..0 ..0..0..1..3....0..1..1..0....1..2..0..0....0..1..1..2....1..2..1..0 CROSSREFS Sequence in context: A196589 A197046 A283633 * A075601 A325216 A161588 Adjacent sequences: A221820 A221821 A221822 * A221824 A221825 A221826 KEYWORD nonn AUTHOR R. H. Hardin Jan 26 2013 STATUS approved

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Last modified February 8 04:10 EST 2023. Contains 360134 sequences. (Running on oeis4.)