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 A217339 Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops. 0
 0, 1, 144, 120908, 838126848, 52019083898820 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Table of n, a(n) for n=1..6. EXAMPLE Some solutions for n=3 ..1..2..0....1..0..0....1..1..0....0..2..0....1..2..0....1..2..1....1..1..1 ..1..3..0....2..1..1....1..1..2....1..3..1....2..2..0....1..1..2....2..1..2 ..0..2..0....1..2..1....1..1..1....0..1..1....0..1..1....1..0..0....1..0..0 CROSSREFS Diagonal of A217346. Sequence in context: A187464 A221735 A272462 * A231827 A203098 A159724 Adjacent sequences: A217336 A217337 A217338 * A217340 A217341 A217342 KEYWORD nonn AUTHOR R. H. Hardin, Oct 01 2012 STATUS approved

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Last modified May 22 19:48 EDT 2024. Contains 372758 sequences. (Running on oeis4.)