OFFSET
1,1
COMMENTS
Column 5 of A228506
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +16*a(n-2) +a(n-3) -27*a(n-4) +a(n-5) +4*a(n-6).
Empirical: g.f. -x*(5+x-14*x^2+x^3+2*x^4) / ( -1+2*x+16*x^2+x^3-27*x^4+x^5+4*x^6 ). - R. J. Mathar, Aug 25 2013
EXAMPLE
Some solutions for n=4
..1..0..0..0..0....1..0..0..0..0....1..0..0..0..0....1..0..0..0..1
..0..0..0..1..0....0..0..1..0..1....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....1..0..0..0..0....0..1..0..0..1....1..0..0..0..0
..0..0..0..0..1....0..0..0..1..0....0..0..0..0..0....0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 23 2013
STATUS
approved