OFFSET
1,1
COMMENTS
Column 4 of A194998
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..24
EXAMPLE
Some solutions for 4X4
..3........2........2........2........2........4........1........4
..2.1......1.0......3.2......3.4......3.2......3.2......2.3......3.2
..3.2.3....0.1.2....2.3.2....2.3.4....2.3.2....2.3.4....3.2.3....4.3.4
..2.1.2.3..1.0.1.2..1.2.3.2..1.2.3.4..1.2.1.2..1.2.3.4..2.1.2.1..3.4.3.2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 07 2011
STATUS
approved