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 A221605 Number of n X 4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns. 0
 4, 53, 811, 12270, 184193, 2764070, 41480899, 622510123, 9342086217, 140197824897, 2103965848896, 31574471975014, 473841949757344, 7111003899609738, 106715702327136893, 1601495553082204043 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A221609. LINKS EXAMPLE Some solutions for n=3 ..1..2..1..0....0..2..2..1....1..1..0..2....0..2..2..1....0..3..2..0 ..1..2..0..1....1..2..1..0....0..2..3..0....1..0..0..0....0..0..2..1 ..1..1..2..0....1..1..1..0....1..0..1..1....1..3..2..0....0..2..2..0 CROSSREFS Cf. A221609. Sequence in context: A241872 A109801 A099340 * A307172 A275801 A158259 Adjacent sequences: A221602 A221603 A221604 * A221606 A221607 A221608 KEYWORD nonn AUTHOR R. H. Hardin, Jan 20 2013 STATUS approved

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Last modified March 26 02:36 EDT 2023. Contains 361529 sequences. (Running on oeis4.)