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A221690 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction 1
13, 1336, 95076, 7033429, 520770016, 38558774282, 2854945130275, 211383822013331, 15651127479431664, 1158829375610866111, 85801199678309146886, 6352829859620504245102, 470371595862197876296617 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A221693

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..78

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A091781 A156641 A300592 * A197630 A222017 A238562

Adjacent sequences:  A221687 A221688 A221689 * A221691 A221692 A221693

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2013

STATUS

approved

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Last modified September 24 23:43 EDT 2022. Contains 356951 sequences. (Running on oeis4.)