OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 2*a(n-2) - 6*a(n-3) + 6*a(n-5) - 2*a(n-6) - 2*a(n-7) + a(n-8) for n>11.
Empirical for n mod 2 = 0: a(n) = n^4 + 10*n^3 + 182*n^2 + 802*n + 6205 for n>3.
Empirical for n mod 2 = 1: a(n) = n^4 + 10*n^3 + 181*n^2 + 780*n + 6084 for n>3.
Empirical g.f.: x*(94249 - 137310*x - 270710*x^2 + 436011*x^3 + 256742*x^4 - 482695*x^5 - 87878*x^6 + 207141*x^7 + 17437*x^8 - 23035*x^9 - 9760*x^10) / ((1 - x)^5*(1 + x)^3). - Colin Barker, Dec 23 2018
EXAMPLE
Some solutions for n=4:
..1..1..1..0..1..0..0..0....1..0..0..0..0..0..0..0....1..1..1..0..0..0..0..0
..1..1..1..1..1..1..1..1....1..0..1..0..1..0..0..0....1..1..0..1..0..1..0..1
..1..1..1..1..1..1..1..1....0..1..0..1..0..1..0..1....1..0..1..0..1..0..1..0
..1..1..1..1..1..1..1..1....1..0..1..0..1..0..1..1....1..1..0..1..0..1..0..1
..0..0..1..1..1..1..1..1....0..1..0..1..0..1..1..1....1..0..1..0..1..0..1..1
..0..0..0..1..1..1..1..1....0..0..1..0..1..0..1..1....0..0..0..1..0..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 14 2015
STATUS
approved