OFFSET
1,1
COMMENTS
Column 4 of A214906
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..120
EXAMPLE
Some solutions for n=4
.....1........2........3........2........1........3........2........2
....1.1......0.4......2.4......2.2......0.2......3.3......1.3......0.4
...0.1.2....0.2.4....3.3.3....1.1.4....0.0.3....2.3.4....1.1.4....0.2.4
..0.0.0.4..0.2.3.3..0.4.4.4..1.1.2.4..1.1.1.1..1.3.4.4..0.1.3.4..1.2.2.3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 29 2012
STATUS
approved