A221128 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor

1, 987, 118472, 16436223, 2152770692, 282454178707, 36946896429843, 4831791752404317, 631836540867287034, 82621661239567004631

Offset

1,2

Comments

Row 4 of A221125

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=3
..0..1..0....1..2..1....2..1..0....1..1..0....1..2..1....0..2..1....1..2..0
..2..1..0....1..1..0....0..1..1....2..1..0....0..0..1....0..3..1....1..3..1
..3..1..0....2..0..0....3..2..0....3..1..1....3..1..2....0..1..1....0..0..1
..2..2..0....0..4..0....1..1..0....0..0..2....0..1..0....1..1..1....0..1..2

Crossrefs

Sequence in context: A072316 A222351 A221696 * A045733 A250490 A258552

Adjacent sequences: A221125 A221126 A221127 * A221129 A221130 A221131

Keyword

nonn

Author

R. H. Hardin Jan 02 2013

Status

approved