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 A221120 Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor 0
 1, 21, 4872, 16436223, 723234356389, 429398881440049645 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A221125 LINKS Table of n, a(n) for n=1..6. EXAMPLE Some solutions for n=3 ..1..0..1....1..1..3....2..0..0....1..1..0....0..3..0....1..0..3....2..0..1 ..0..2..1....0..1..0....1..4..0....1..1..3....1..0..2....0..2..1....0..4..0 ..3..0..1....1..1..1....0..0..2....1..1..0....0..1..2....0..2..0....0..0..2 CROSSREFS Sequence in context: A209473 A055416 A220620 * A203370 A232344 A074053 Adjacent sequences: A221117 A221118 A221119 * A221121 A221122 A221123 KEYWORD nonn AUTHOR R. H. Hardin Jan 02 2013 STATUS approved

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Last modified December 6 20:29 EST 2023. Contains 367616 sequences. (Running on oeis4.)