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A221927 Number of nX4 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
13, 2197, 201378, 20246283, 2007184132, 199492714651, 19816266524892, 1968651817039048, 195572208446932549, 19428830291892380296, 1930127245301117267451, 191745542191155118363255 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A221929

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..49

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A075601 A325216 A161588 * A013718 A145187 A221896

Adjacent sequences:  A221924 A221925 A221926 * A221928 A221929 A221930

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 01 2013

STATUS

approved

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Last modified November 26 21:04 EST 2021. Contains 349344 sequences. (Running on oeis4.)