OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = Sum_{j=5..n+4} Stirling2(n+4,j).
EXAMPLE
Some solutions for n=5:
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....0....1....1....1....1....1....1....1....1....1....1....0....1
..2....1....1....1....0....2....2....1....2....1....2....1....2....2....1....1
..0....2....2....2....2....3....3....2....3....2....3....2....0....3....2....1
..3....0....3....1....2....0....0....3....1....0....2....2....3....2....1....2
..0....3....3....3....3....4....4....4....4....2....4....1....3....3....3....3
..1....4....3....4....4....2....1....1....0....3....1....3....0....0....0....2
..0....1....0....1....4....4....3....1....2....4....5....0....4....4....4....0
..4....0....4....1....5....4....5....2....0....5....4....4....5....5....0....4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 15 2012
STATUS
approved