OFFSET
1,1
COMMENTS
Column 4 of A203923
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +4*a(n-2) +21*a(n-4) -44*a(n-5) +77*a(n-6) +158*a(n-7) -83*a(n-8) -645*a(n-9) +64*a(n-10) -2301*a(n-11) -3155*a(n-12) +1580*a(n-13) +6476*a(n-14) +55*a(n-15) +15516*a(n-16) +19296*a(n-17) -747*a(n-18) -810*a(n-19) -5913*a(n-20) -75627*a(n-21) -49815*a(n-22) +27054*a(n-23) -243*a(n-24) +19926*a(n-25) +11664*a(n-26) +10935*a(n-27) -6561*a(n-28) for n>29
EXAMPLE
Some solutions for n=3
..0..1..0..0..1..0....0..1..0..0..1..0....0..1..1..1..0..0....0..1..0..0..0..0
..1..0..0..0..0..1....0..0..1..0..0..0....1..1..1..0..0..0....1..0..1..0..0..1
..0..0..0..0..0..1....0..0..0..1..0..0....1..1..0..0..0..0....0..1..0..1..1..0
..0..0..0..0..1..0....0..0..0..0..1..1....1..0..0..0..0..0....0..0..1..1..1..0
..0..0..1..1..0..1....0..1..0..0..0..1....0..0..1..0..0..1....0..1..1..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 07 2012
STATUS
approved