OFFSET
1,1
COMMENTS
Column 3 of A218638
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1) +7*a(n-2) +7*a(n-3) +7*a(n-4) +7*a(n-5) +3*a(n-6) +21*a(n-7) +6*a(n-8) +6*a(n-9) +6*a(n-10) +6*a(n-11) +3*a(n-12) +9*a(n-13) -9*a(n-14) -9*a(n-15) -9*a(n-16) -9*a(n-17) -9*a(n-18) -9*a(n-19)
EXAMPLE
Some solutions for n=3
..0..0..0....1..0..0....0..1..0....0..0..0....1..1..0....1..1..0....1..0..0
..0..1..1....0..1..1....1..0..1....1..0..1....0..0..0....0..1..1....1..0..0
..1..1..0....0..0..1....0..0..0....0..1..1....0..0..0....1..1..0....0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 03 2012
STATUS
approved