A221932 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns

1, 1367, 153652, 20246283, 2568601026, 326363935235, 41397744561659, 5246761195398438, 664828879659318271, 84233175060135140710

Offset

1,2

Comments

Row 4 of A221929

Links

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

Example

Some solutions for n=3
..1..1..2....1..0..1....0..2..1....1..0..2....0..1..1....1..1..2....0..0..2
..0..0..1....1..1..1....0..1..2....2..0..1....0..1..1....0..0..1....0..6..0
..0..3..2....0..1..1....1..1..1....0..1..0....0..2..1....1..1..4....1..1..0
..0..2..0....1..3..1....0..1..2....1..2..2....2..2..1....0..1..0....0..1..1

Crossrefs

Sequence in context: A020409 A231268 A192823 * A331464 A167724 A156574

Adjacent sequences: A221929 A221930 A221931 * A221933 A221934 A221935

Keyword

nonn

Author

R. H. Hardin Feb 01 2013

Status

approved