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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 4 18:08 EST 2021. Contains 349526 sequences. (Running on oeis4.)