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 A221133 Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2 0
 0, 9, 656, 643204, 4235650596, 259039174953636 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A221139 LINKS Table of n, a(n) for n=1..6. EXAMPLE Some solutions for n=3 ..2..1..0....2..2..1....0..2..1....0..1..2....2..2..1....0..0..1....2..1..0 ..1..2..1....2..0..1....2..1..0....1..0..2....1..0..2....1..1..2....2..2..1 ..0..2..0....0..0..1....2..1..0....2..1..0....0..0..1....2..2..0....0..1..0 CROSSREFS Sequence in context: A081232 A020548 A091062 * A015007 A054327 A209964 Adjacent sequences: A221130 A221131 A221132 * A221134 A221135 A221136 KEYWORD nonn AUTHOR R. H. Hardin Jan 02 2013 STATUS approved

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Last modified February 27 16:21 EST 2024. Contains 370378 sequences. (Running on oeis4.)