OFFSET
1,1
COMMENTS
Column 7 of A217954
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +6*a(n-8) -4*a(n-9) +6*a(n-10) +4*a(n-11) +5*a(n-12) +6*a(n-13) +7*a(n-14) +8*a(n-15) +4*a(n-16) +6*a(n-17) +5*a(n-18) +4*a(n-19) +3*a(n-20) +2*a(n-21) +a(n-22)
EXAMPLE
Some solutions for n=4
..3....2....0....3....1....0....1....1....1....0....1....0....1....0....1....3
..2....2....3....1....3....1....1....1....3....1....2....3....3....2....2....3
..1....2....2....0....2....2....0....3....2....2....3....2....0....3....1....3
..1....1....1....0....2....2....0....3....1....0....3....2....0....3....1....3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 15 2012
STATUS
approved