A221615 Number of 7Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns

0, 64, 42810, 41480899, 33145684280, 27294219603383, 22596355738886108, 18795109923272155626

Offset

1,2

Comments

Row 7 of A221609

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A223353 A098843 A159400 * A141092 A283924 A016830

Adjacent sequences: A221612 A221613 A221614 * A221616 A221617 A221618

Keyword

nonn

Author

R. H. Hardin Jan 20 2013

Status

approved