OFFSET
1,2
COMMENTS
Diagonal of A252828
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..25
EXAMPLE
Some solutions for n=4
..0..1..2..3....0..1..1..2....0..1..1..2....0..1..2..3....0..1..2..2
..0..1..2..3....0..1..2..3....0..1..1..2....1..2..3..4....0..1..2..2
..1..2..3..4....1..2..3..3....0..1..2..3....2..3..3..4....1..2..3..3
..2..3..4..5....2..2..3..4....1..2..2..3....3..4..4..5....2..3..3..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 22 2014
STATUS
approved