OFFSET
1,1
COMMENTS
Column 4 of A200990.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..52
EXAMPLE
Some solutions for n=3
..0..1..1..3....0..1..2..3....0..1..2..3....0..1..2..3....0..1..1..2
..0..2..2..3....0..1..2..3....0..1..2..4....0..1..2..3....0..1..3..3
..0..2..4..4....3..4..4..4....0..3..4..4....0..4..4..4....2..4..4..4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 25 2011
STATUS
approved