OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) + a(n-5) + a(n-6).
Empirical g.f.: x*(21 + 30*x + 34*x^2 + 33*x^3 + 27*x^4 + 16*x^5) / (1 - x - x^2 - x^3 - x^4 - x^5 - x^6). - Colin Barker, Nov 01 2018
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....0....1....1....1....1....1
..2....0....0....1....2....2....2....2....2....2....1....2....2....2....0....2
..3....2....2....2....0....0....3....3....3....3....2....0....3....1....2....3
..2....3....3....3....3....3....4....0....4....4....3....3....3....3....3....4
..4....4....4....4....4....4....5....4....1....0....4....4....4....4....4....2
..5....5....5....5....5....5....1....5....5....5....5....5....5....5....5....5
..0....2....1....0....1....2....0....1....0....1....1....1....0....0....0....0
..1....1....0....2....2....1....3....3....2....2....0....0....1....4....1....1
..3....0....0....1....1....0....2....2....3....4....5....2....2....2....5....3
..3....3....2....4....0....5....1....0....2....3....2....5....3....1....2....5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 08 2014
STATUS
approved