A221725 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor

1, 2989, 429160, 81980587, 14223656107, 2507976517152, 439747190895603, 77182226468656287, 13541666058334423392, 2376046290419395692015, 416894941050089368969405

Offset

1,2

Comments

Row 4 of A221723

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=3
..0..0..1....0..0..1....0..0..2....0..1..0....0..0..2....0..1..1....0..0..2
..0..2..3....0..4..1....2..2..0....0..4..1....1..3..3....1..0..3....3..2..1
..2..3..0....0..3..0....2..2..0....0..0..2....0..0..1....0..0..1....0..0..0
..0..0..1....1..2..0....1..0..1....0..2..2....1..1..0....1..3..1....0..4..0

Crossrefs

Sequence in context: A349063 A108926 A159731 * A205241 A317398 A346221

Adjacent sequences: A221722 A221723 A221724 * A221726 A221727 A221728

Keyword

nonn

Author

R. H. Hardin Jan 22 2013

Status

approved