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 A221783 Number of nX4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns 0
 0, 3, 5, 16, 41, 105, 288, 735, 1981, 5156, 13685, 35973, 94940, 250271, 659721, 1739740, 4585933, 12092245, 31878636, 84050611, 221594145, 584232168, 1540316025 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 4 of A221787 LINKS Table of n, a(n) for n=1..23. FORMULA Empirical: a(n) = 5*a(n-2) + 5*a(n-3) + a(n-5). - Vaclav Kotesovec, May 23 2013 EXAMPLE All solutions for n=3 ..0..2..2..1....0..1..1..1....0..2..2..1....0..2..1..1....0..2..2..1 ..0..2..2..0....0..2..2..0....0..2..1..0....0..1..2..0....0..1..1..0 ..1..1..1..0....1..2..2..0....1..1..2..0....1..2..2..0....1..2..2..0 CROSSREFS Sequence in context: A121646 A226205 A300533 * A243321 A099101 A208819 Adjacent sequences: A221780 A221781 A221782 * A221784 A221785 A221786 KEYWORD nonn AUTHOR R. H. Hardin Jan 25 2013 STATUS approved

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Last modified September 24 22:14 EDT 2023. Contains 365582 sequences. (Running on oeis4.)