OFFSET
3,1
COMMENTS
EXAMPLE
There are a(3) = 5 non-equivalent ways to place 5 points (X) on a 3 X 3 grid:
X . X X . X . X X X X . X . X
X . X X . . X . X X . . X X .
. X . . X X . X . . X X . X .
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Heinrich Ludwig, Jan 12 2014
EXTENSIONS
a(13), a(14) from Heinrich Ludwig, Nov 16 2016
STATUS
approved