A221789 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns

0, 0, 1, 16, 173, 1325, 15936, 187794, 2167196, 25071259, 290320330, 3362811279, 38954814644, 451260930462, 5227519694115, 60556885619049, 701505602257606, 8126407466223744, 94138215587957627, 1090519135777805628

Offset

1,4

Comments

Row 4 of A221787

Links

R. H. Hardin, Table of n, a(n) for n = 1..28

Example

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

Crossrefs

Sequence in context: A200673 A230510 A238725 * A018209 A021174 A021374

Adjacent sequences: A221786 A221787 A221788 * A221790 A221791 A221792

Keyword

nonn

Author

R. H. Hardin Jan 25 2013

Status

approved