OFFSET
1,1
COMMENTS
Column 4 of A223999
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 15*a(n-1) -69*a(n-2) +66*a(n-3) +226*a(n-4) -172*a(n-5) -1192*a(n-6) +2157*a(n-7) -1714*a(n-8) -2876*a(n-9) +4966*a(n-10) +12095*a(n-11) -17584*a(n-12) +28968*a(n-13) +156*a(n-14) -2874*a(n-15) -2964*a(n-16) +15876*a(n-17) +1008*a(n-18) for n>19
EXAMPLE
Some solutions for n=3
..0..0..2..2....0..1..1..1....0..0..0..0....0..0..1..1....0..1..1..2
..0..1..1..2....1..1..1..2....0..0..2..2....0..0..2..2....0..0..1..2
..1..1..1..1....0..2..2..2....1..1..1..2....0..2..2..2....0..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 30 2013
STATUS
approved