A221758 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns

0, 8, 1, 241, 748, 16715, 117067, 1557684, 14265803, 161569614, 1620282797, 17408729025, 179900894011, 1900169117498, 19826703745763, 208284274385624, 2179869985099525, 22861530838829623, 239488491429326898

Offset

1,2

Comments

Row 4 of A221755

Links

R. H. Hardin, Table of n, a(n) for n = 1..26

Example

Single solution for n=3
..0..2..1
..1..2..0
..0..2..1
..1..2..0

Crossrefs

Sequence in context: A132056 A051187 A284865 * A322699 A209244 A300220

Adjacent sequences: A221755 A221756 A221757 * A221759 A221760 A221761

Keyword

nonn

Author

R. H. Hardin Jan 24 2013

Status

approved