OFFSET
1,4
COMMENTS
Column 1 of A209365
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) -3*a(n-2) +3*a(n-3) -5*a(n-4) +5*a(n-5) -5*a(n-6) +9*a(n-7) -8*a(n-8) +2*a(n-9) +a(n-10) -4*a(n-11) +16*a(n-12) -22*a(n-13) +18*a(n-14) -16*a(n-15) +13*a(n-16) -8*a(n-17) -4*a(n-18) +2*a(n-19) -5*a(n-20) +9*a(n-21) -7*a(n-22) +6*a(n-23) -4*a(n-24) +4*a(n-25) -a(n-26) -a(n-27) -a(n-28)
EXAMPLE
Some solutions for n=8
..3....3....1....1....2....1....1....2....1....3....2....2....1....1....2....2
..3....1....1....1....2....1....1....2....1....1....3....2....1....1....2....2
..3....1....1....1....2....3....3....2....1....1....2....2....2....2....2....2
..3....3....2....1....2....1....3....2....1....3....2....2....3....2....2....2
..3....3....2....2....3....1....3....2....1....1....3....2....2....2....1....2
..3....1....2....2....1....3....3....2....1....1....2....1....2....2....1....2
..1....1....2....2....1....1....3....1....1....1....1....1....3....2....1....2
..1....3....2....2....3....1....3....1....1....1....1....1....2....2....1....2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 06 2012
STATUS
approved