A217339 - OEIS

A217339

Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops.

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.

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 01 2012

STATUS

approved