A221334 Number of 7Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2

1, 114243, 162555929, 374176705928, 676612123702617, 1252783082725664892, 2242286238164144345340, 3997304037038003330432187

Offset

1,2

Comments

Row 7 of A221328

Links

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

Example

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

Crossrefs

Sequence in context: A138266 A175697 A023092 * A069371 A143725 A119128

Adjacent sequences: A221331 A221332 A221333 * A221335 A221336 A221337

Keyword

nonn

Author

R. H. Hardin Jan 11 2013

Status

approved