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A221384 Number of nX4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2 1
0, 7, 94, 1198, 15181, 191832, 2420113, 30504742, 384323166, 4840824840, 60965809190, 767757426068, 9668215933583, 121747651964992, 1533100467093783, 19305382814565606, 243100053770292709, 3061195602161506408 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A221388

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..20

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A134113 A071584 A132114 * A243679 A327843 A015225

Adjacent sequences:  A221381 A221382 A221383 * A221385 A221386 A221387

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 14 2013

STATUS

approved

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Last modified January 29 05:09 EST 2022. Contains 350672 sequences. (Running on oeis4.)