OFFSET
1,2
COMMENTS
Diagonal of A252820
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..40
EXAMPLE
Some solutions for n=4
..0..0..1..2....0..1..2..3....0..1..1..2....0..1..1..2....0..1..2..2
..0..0..1..2....1..1..2..3....0..1..1..2....1..2..2..3....1..2..2..3
..0..1..2..3....2..2..3..4....0..1..2..3....2..2..3..3....2..2..3..4
..1..2..3..4....2..3..4..4....1..2..3..4....2..3..3..4....3..3..4..5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 22 2014
STATUS
approved