A221729 - OEIS

A221729

Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with every occupancy equal to zero or two

0, 16, 0, 540, 0, 22180, 0, 911081, 0, 37357844, 0, 1530451369, 0, 62678117602, 0, 2566608259733, 0, 105095354454990, 0, 4303284726664321, 0, 176203240002820998, 0, 7214839389152381265, 0, 295419432979789366510, 0, 12096265452242634926017

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OFFSET

1,2

COMMENTS

Row 3 of A221728

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..32

EXAMPLE

Some solutions for n=4

..0..2..0..0....2..0..2..0....2..0..2..0....2..2..2..0....2..0..0..2

..0..2..2..0....0..2..2..0....0..2..0..0....0..0..0..2....2..2..2..2

..2..2..0..2....2..0..2..0....0..2..2..2....2..0..0..2....0..0..0..0