OFFSET
1,1
COMMENTS
Column 3 of A252148
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-2) +3*a(n-3) +a(n-4) -9*a(n-5) -2*a(n-6) -3*a(n-7) -6*a(n-8) +3*a(n-9) -8*a(n-10) +27*a(n-11) +3*a(n-12) +27*a(n-13) +2*a(n-14) -12*a(n-15) -33*a(n-17) +a(n-18) -27*a(n-19) +6*a(n-20) +9*a(n-21) +8*a(n-22) +15*a(n-23) -2*a(n-24) +3*a(n-25) -5*a(n-26) -3*a(n-27) -a(n-28) +a(n-30) for n>36
EXAMPLE
Some solutions for n=4
..3..0..3..2..0....2..0..3..0..2....0..2..1..2..0....3..3..1..3..3
..3..0..3..3..0....1..3..1..3..3....0..0..3..0..0....3..0..3..0..3
..1..3..1..1..3....3..0..3..0..2....3..3..1..3..3....1..3..1..3..1
..3..0..3..3..0....1..3..1..3..1....2..3..1..3..2....3..0..3..0..2
..3..0..3..3..0....2..0..3..0..2....0..0..3..0..0....1..3..1..3..3
..1..3..1..1..3....0..2..1..3..3....3..2..2..3..1....3..0..3..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 14 2014
STATUS
approved