OFFSET
1,2
COMMENTS
Row 2 of A221035.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) +a(n-2) -4*a(n-3) -12*a(n-4) -2*a(n-5) +22*a(n-6) -20*a(n-7) +16*a(n-8) +8*a(n-9) -6*a(n-10) -10*a(n-11) +a(n-12) +2*a(n-13) -2*a(n-14) +2*a(n-15) for n>19.
EXAMPLE
Some solutions for n=3
..1..1..1....1..0..1....1..1..1....1..1..0....0..0..1....0..0..1....0..1..1
..1..1..1....1..1..0....0..1..1....1..0..0....0..1..1....0..0..1....1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2012
STATUS
approved