A221812 Number of 4Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns

1, 233, 3426, 197048, 5873327, 239116581, 8354914378, 314589265052, 11412369050409, 421725969587315, 15441431209200525, 567978925346570936, 20844338781073670408, 765835006795542240689, 28121494605427446146221

Offset

1,2

Comments

Row 4 of A221809

Links

R. H. Hardin, Table of n, a(n) for n = 1..28

Example

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

Crossrefs

Sequence in context: A028474 A101218 A250464 * A219065 A301956 A220567

Adjacent sequences: A221809 A221810 A221811 * A221813 A221814 A221815

Keyword

nonn

Author

R. H. Hardin Jan 26 2013

Status

approved