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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
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
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.)