OFFSET
1,1
COMMENTS
Column 2 of A231806
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) +3*a(n-2) +19*a(n-3) +11*a(n-4) -49*a(n-5) -56*a(n-6) -47*a(n-7) -70*a(n-8) +91*a(n-9) -34*a(n-10) -20*a(n-11) +110*a(n-12) -76*a(n-13) +126*a(n-14) +32*a(n-15) +27*a(n-16) +48*a(n-17) +a(n-18) +4*a(n-19) +4*a(n-20)
EXAMPLE
Some solutions for n=7
..1..0..0....0..0..1....0..0..0....0..1..0....1..1..1....0..0..0....1..0..0
..0..0..0....1..0..0....1..0..0....0..0..0....0..0..0....0..0..0....0..0..0
..0..0..0....1..0..0....0..0..1....0..0..0....0..0..0....0..0..1....0..1..1
..1..0..0....1..0..0....0..0..1....1..0..1....0..0..0....0..0..0....1..0..0
..0..1..0....1..0..0....0..0..1....1..0..0....0..0..0....0..1..0....1..0..0
..0..0..1....0..0..1....0..1..0....0..0..1....1..0..1....1..0..1....0..0..1
..0..0..0....1..0..0....0..0..0....0..0..0....0..0..0....0..0..0....1..0..0
..1..0..0....1..0..0....0..0..1....0..0..0....1..0..1....1..0..0....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 13 2013
STATUS
approved