A221392 Number of 6Xn 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, 0, 121, 191832, 63358088, 23796035743, 7392392443622, 2337157741074086, 714565383546558879, 218604352253920063447, 66455737946796228603868, 20186583052419136813733221, 6123478328359855143647144369

Offset

1,3

Comments

Row 6 of A221388

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=3
..0..2..1....0..2..1....0..2..1....0..2..1....0..2..1....0..2..1....0..2..1
..1..2..1....0..2..1....0..2..1....0..2..0....1..2..1....1..2..0....1..2..0
..0..2..1....0..2..1....1..2..1....1..2..1....0..2..0....0..2..1....1..2..1
..0..2..0....1..2..1....0..2..1....1..2..1....1..2..0....0..2..1....0..2..1
..0..2..1....0..2..0....0..2..0....0..2..1....0..2..1....1..2..0....0..2..0
..1..2..0....1..2..0....1..2..0....0..2..0....1..2..0....1..2..0....1..2..0

Crossrefs

Sequence in context: A013749 A178192 A135825 * A337728 A227301 A261364

Adjacent sequences: A221389 A221390 A221391 * A221393 A221394 A221395

Keyword

nonn

Author

R. H. Hardin Jan 14 2013

Status

approved