OFFSET
1,3
COMMENTS
Column 4 of A271246.
EXAMPLE
Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.2......1.0......1.2......1.0......0.1......1.2......1.1......1.2
...1.0.0....2.0.3....3.4.3....1.2.3....1.0.0....3.3.3....2.3.4....3.1.3
..3.0.4.0..1.3.0.4..3.4.3.4..2.1.2.4..2.2.1.1..4.1.0.4..4.2.1.4..2.4.3.1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 02 2016
STATUS
approved