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 A221893 Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops or left turns 0
 0, 0, 90, 4137, 154458, 5488703, 201212852, 7816225089, 303242246539, 11670544747194, 449384417173902, 17313378667903125, 666942058278936822, 25692119785626315240, 989734547009551775051 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Row 4 of A221890 LINKS EXAMPLE Some solutions for n=4 ..0..2..0..1....0..3..2..1....1..2..2..1....0..2..2..0....0..2..3..1 ..1..1..3..0....0..1..2..0....0..1..1..0....0..2..2..1....0..2..1..0 ..1..2..2..1....0..1..1..1....1..2..1..0....0..1..2..1....0..1..1..0 ..0..1..1..0....0..1..3..0....0..1..2..1....0..1..2..0....1..2..2..0 CROSSREFS Sequence in context: A017806 A035740 A017753 * A197194 A281580 A111599 Adjacent sequences:  A221890 A221891 A221892 * A221894 A221895 A221896 KEYWORD nonn AUTHOR R. H. Hardin Jan 30 2013 STATUS approved

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Last modified August 11 20:13 EDT 2022. Contains 356067 sequences. (Running on oeis4.)