OFFSET
1,1
COMMENTS
Column 4 of A224651
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) -3*a(n-2) +36*a(n-3) -144*a(n-4) +108*a(n-5) -503*a(n-6) +2012*a(n-7) -1509*a(n-8) +3480*a(n-9) -13920*a(n-10) +10440*a(n-11) -12564*a(n-12) +50256*a(n-13) -37692*a(n-14) +22464*a(n-15) -89856*a(n-16) +67392*a(n-17) -15552*a(n-18) +62208*a(n-19) -46656*a(n-20)
EXAMPLE
Some solutions for n=2
..0..1..1..1..1..0....1..0..0..1..0..0....0..1..1..0..1..1....1..1..0..0..0..1
..1..0..0..1..0..1....0..0..0..0..1..1....1..0..1..1..0..1....1..0..1..1..1..0
..1..0..1..0..0..1....1..1..1..1..0..0....1..0..1..1..0..1....0..0..0..1..0..0
..0..1..1..1..1..0....0..1..0..0..1..0....1..0..1..1..0..1....1..1..0..0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 13 2013
STATUS
approved