OFFSET
1,1
COMMENTS
Column 2 of A204651.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) - 5*a(n-2) + 5*a(n-4) - 4*a(n-5) + a(n-6).
Conjectures from Colin Barker, Jun 08 2018: (Start)
G.f.: x*(16 - 32*x + 8*x^2 + 26*x^3 - 23*x^4 + 6*x^5) / ((1 - x)^5*(1 + x)).
a(n) = (576 + 704*n + 232*n^2 + 16*n^3 + 2*n^4)/96 for n even.
a(n) = (582 + 704*n + 232*n^2 + 16*n^3 + 2*n^4)/96 for n odd.
(End)
EXAMPLE
Some solutions for n=5:
..0..0..0....0..0..1....0..0..0....0..0..0....0..0..0....0..0..1....0..1..1
..0..0..0....0..0..1....0..0..1....0..0..1....0..0..0....0..1..1....0..1..1
..0..0..0....0..0..1....0..1..1....0..0..1....0..0..0....0..1..1....0..1..1
..0..0..0....0..1..1....0..1..1....0..0..1....0..1..1....0..1..1....0..1..1
..0..0..1....0..1..1....0..1..1....0..0..1....1..1..1....1..1..1....0..1..1
..1..1..1....1..1..1....1..1..1....0..0..1....1..1..1....1..1..1....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 17 2012
STATUS
approved