OFFSET
1,1
COMMENTS
Column 4 of A206987
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) -4*a(n-2) +10*a(n-3) -18*a(n-4) +8*a(n-5) -16*a(n-6) -4*a(n-7) -3*a(n-8) +21*a(n-9) +13*a(n-10) -12*a(n-11) for n>13
EXAMPLE
Some solutions for n=4
..1..0..0..1....1..1..1..1....0..0..1..1....1..1..1..0....1..1..1..1
..0..0..0..1....1..1..1..1....1..1..1..1....0..1..1..0....0..1..1..1
..0..0..0..0....1..1..1..0....1..1..1..1....0..1..1..1....0..1..1..1
..1..0..0..0....1..0..0..0....0..0..0..0....1..1..1..1....1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 14 2012
STATUS
approved