A221941 Number of 5Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.

1, 2627, 376389, 84547866, 17626884659, 3719159201319, 782051177169672, 164583386567947853, 34629683921533060992, 7286522628060662000197

Offset

1,2

Comments

Row 5 of A221937

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A292175 A295482 A236621 * A234698 A190936 A020439

Adjacent sequences: A221938 A221939 A221940 * A221942 A221943 A221944

Keyword

nonn

Author

R. H. Hardin, Feb 01 2013

Status

approved