A221138 Number of n X 7 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

32, 57121, 58132316, 75512292025, 86907967843320, 106295637843093924

Offset

1,1

Comments

Column 7 of A221139.

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Cf. A221139.

Sequence in context: A362175 A221086 A054374 * A017009 A176030 A034245

Adjacent sequences: A221135 A221136 A221137 * A221139 A221140 A221141

Keyword

nonn

Author

R. H. Hardin Jan 02 2013

Status

approved