OFFSET
1,1
COMMENTS
Column 4 of A207088.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
Robert Israel, Maple-assisted proof of formula
FORMULA
Empirical: a(n) = 11*a(n-1) -11*a(n-2) -195*a(n-3) +361*a(n-4) +1387*a(n-5) -2443*a(n-6) -5105*a(n-7) +6602*a(n-8) +9836*a(n-9) -7666*a(n-10) -9322*a(n-11) +3553*a(n-12) +4167*a(n-13) -507*a(n-14) -741*a(n-15) +25*a(n-16) +51*a(n-17) -a(n-18) -a(n-19).
Formula confirmed by Robert Israel, May 15 2018 (see link).
EXAMPLE
Some solutions for n=4
..1..1..0..1....1..1..0..1....1..0..0..1....0..0..1..1....1..1..0..1
..0..1..0..1....1..0..0..1....0..1..1..0....1..1..1..1....1..1..0..1
..1..0..0..1....0..1..0..0....1..0..1..0....0..1..1..1....0..1..0..0
..0..1..0..1....1..1..0..1....1..1..1..0....0..1..1..0....0..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 15 2012
STATUS
approved