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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 1
0, 8, 1, 241, 748, 16715, 117067, 1557684, 14265803, 161569614, 1620282797, 17408729025, 179900894011, 1900169117498, 19826703745763, 208284274385624, 2179869985099525, 22861530838829623, 239488491429326898 (list; graph; refs; listen; history; text; internal format)
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

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Last modified April 8 12:31 EDT 2020. Contains 333314 sequences. (Running on oeis4.)