OFFSET
1,1
COMMENTS
Column 4 of A208420.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) -10*a(n-3) -15*a(n-4) +40*a(n-5) +19*a(n-6) -25*a(n-7) -60*a(n-8) +32*a(n-9) -10*a(n-10) +29*a(n-11) +28*a(n-12) +43*a(n-13) -83*a(n-14) -24*a(n-15) +4*a(n-16) +30*a(n-17) -13*a(n-18) +20*a(n-19) +a(n-20) -3*a(n-21) -8*a(n-22) +4*a(n-23) -2*a(n-24) -a(n-25) +a(n-27).
EXAMPLE
Some solutions for n=4
..0..1..1..0....1..1..1..1....1..0..1..1....1..1..0..0....0..1..1..1
..0..1..1..1....1..1..1..1....0..1..1..0....1..1..1..0....1..0..1..0
..1..1..0..0....1..1..1..1....1..0..1..1....0..1..0..1....0..1..0..0
..0..1..0..1....1..1..0..1....0..1..1..0....1..1..1..0....1..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 26 2012
STATUS
approved