OFFSET
1,1
COMMENTS
Row 5 of A207403
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +8*a(n-2) -18*a(n-3) -27*a(n-4) +72*a(n-5) +48*a(n-6) -168*a(n-7) -42*a(n-8) +252*a(n-9) -252*a(n-11) +42*a(n-12) +168*a(n-13) -48*a(n-14) -72*a(n-15) +27*a(n-16) +18*a(n-17) -8*a(n-18) -2*a(n-19) +a(n-20)
EXAMPLE
Some solutions for n=4
..0..0..0..0....1..1..0..0....0..0..0..0....1..0..1..0....1..1..0..0
..1..0..0..0....0..0..0..0....0..1..0..0....0..1..0..0....1..1..1..0
..0..0..0..0....1..0..0..0....0..0..0..0....0..1..0..0....1..1..1..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..1..0..0....1..1..1..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..1..0..0....1..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 17 2012
STATUS
approved