OFFSET
1,2
COMMENTS
Column 2 of A209610
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) +5*a(n-4) +16*a(n-5) +23*a(n-6) +6*a(n-7) -6*a(n-8) -21*a(n-9) -8*a(n-10) -9*a(n-11) -5*a(n-12) -4*a(n-13) +a(n-15) for n>16
EXAMPLE
Some solutions for n=4
..2..2....2..2....2..2....1..2....2..2....1..1....1..1....1..2....2..1....1..2
..2..1....2..2....1..2....1..2....2..1....1..1....1..2....1..2....2..1....1..2
..2..1....2..2....1..2....1..2....2..1....2..2....2..1....2..2....2..2....1..2
..1..1....2..2....2..2....1..2....2..2....2..2....1..1....2..2....1..1....2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2012
STATUS
approved