OFFSET
1,1
COMMENTS
Column 4 of A208840.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1) - 8*a(n-2) - 27*a(n-3) + 45*a(n-4) + 24*a(n-5) - 51*a(n-6) - 3*a(n-7) + 16*a(n-8) - a(n-9) - a(n-10) for n>11.
Empirical g.f.: x*(10 + 30*x - 338*x^2 - 49*x^3 + 1531*x^4 - 114*x^5 - 1834*x^6 + 200*x^7 + 612*x^8 - 63*x^9 - 41*x^10) / ((1 - x)*(1 + x)*(1 - 3*x + x^2)*(1 + x - x^2)*(1 - x - x^2)*(1 - 4*x - x^2)). - Colin Barker, Mar 07 2018
EXAMPLE
Some solutions for n=4:
..1..1..1..1....0..1..0..0....1..0..1..0....1..0..1..1....0..1..0..1
..0..1..0..1....0..1..0..1....1..0..1..0....0..1..1..0....1..0..1..0
..1..1..1..1....1..1..0..0....1..0..1..1....1..0..1..0....0..1..0..1
..0..1..0..1....0..1..0..1....1..0..1..0....0..1..1..0....1..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved