A221761 Number of 7Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns

0, 64, 0, 45956, 381174, 122732982, 4330440582

Offset

1,2

Comments

Row 7 of A221755

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A243775 A066608 A247067 * A085339 A203262 A174927

Adjacent sequences: A221758 A221759 A221760 * A221762 A221763 A221764

Keyword

nonn

Author

R. H. Hardin Jan 24 2013

Status

approved