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A221940 Number of 4Xn 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
1, 489, 24535, 1759041, 119035112, 8118923949, 552777330287, 37650441405451, 2564181255574899, 174635497977344862, 11893675692936218866, 810026663520753630706, 55167419097633745309553, 3757214394165203187203557 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221937

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..24

EXAMPLE

Some solutions for n=3

..1..3..0....0..1..1....2..0..1....1..0..1....0..1..1....0..1..0....1..1..0

..0..0..1....3..0..1....1..0..0....1..3..0....3..0..1....2..3..0....1..4..0

..1..2..0....0..2..0....2..3..0....0..1..1....1..1..3....1..1..2....0..2..0

..2..1..1....2..1..1....1..1..1....2..1..1....0..1..0....1..0..1....0..2..1

CROSSREFS

Sequence in context: A214807 A251676 A230005 * A221739 A068751 A172951

Adjacent sequences:  A221937 A221938 A221939 * A221941 A221942 A221943

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 01 2013

STATUS

approved

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Last modified January 18 00:48 EST 2022. Contains 350410 sequences. (Running on oeis4.)