OFFSET
1,1
COMMENTS
Row 4 of A207169.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + 13*a(n-3) + 3*a(n-4) + 3*a(n-5) - 27*a(n-6) - 18*a(n-7) + 27*a(n-9) for n>11.
Empirical g.f.: x*(8 + 56*x + 104*x^2 + 331*x^3 + 153*x^4 - 60*x^5 - 819*x^6 - 828*x^7 - 54*x^8 + 837*x^9 + 324*x^10) / ((1 - x - 13*x^3 - 3*x^4 - 3*x^5 + 27*x^6 + 18*x^7 - 27*x^9)). - Colin Barker, Jun 20 2018
EXAMPLE
Some solutions for n=4:
..1..0..0..1....1..1..0..0....1..1..1..1....0..1..0..0....0..0..1..1
..0..1..1..1....0..0..1..0....0..1..1..1....0..1..0..0....0..1..0..0
..0..0..1..1....0..0..1..0....0..1..1..0....0..1..0..0....0..1..0..0
..0..0..1..0....0..0..1..0....0..0..1..0....0..1..0..0....0..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 15 2012
STATUS
approved