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

0, 7, 94, 1198, 15181, 191832, 2420113, 30504742, 384323166, 4840824840, 60965809190, 767757426068, 9668215933583, 121747651964992, 1533100467093783, 19305382814565606, 243100053770292709, 3061195602161506408

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 A367162 A360474

Adjacent sequences: A221381 A221382 A221383 * A221385 A221386 A221387

Keyword

nonn

Author

R. H. Hardin Jan 14 2013

Status

approved