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 A221789 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns 1
 0, 0, 1, 16, 173, 1325, 15936, 187794, 2167196, 25071259, 290320330, 3362811279, 38954814644, 451260930462, 5227519694115, 60556885619049, 701505602257606, 8126407466223744, 94138215587957627, 1090519135777805628 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Row 4 of A221787 LINKS R. H. Hardin, Table of n, a(n) for n = 1..28 EXAMPLE All solutions for n=3 ..0..2..1 ..1..2..0 ..0..2..1 ..1..2..0 CROSSREFS Sequence in context: A200673 A230510 A238725 * A018209 A021174 A021374 Adjacent sequences: A221786 A221787 A221788 * A221790 A221791 A221792 KEYWORD nonn AUTHOR R. H. Hardin Jan 25 2013 STATUS approved

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Last modified November 28 05:31 EST 2022. Contains 358407 sequences. (Running on oeis4.)