OFFSET
1,1
COMMENTS
Column 7 of A188992
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 35*a(n-1) -175*a(n-2) -1169*a(n-3) +8904*a(n-4) -5838*a(n-5) -78636*a(n-6) +390264*a(n-7) -535812*a(n-8) -1472012*a(n-9) +4073408*a(n-10) -2206456*a(n-11) +439232*a(n-12) -2614848*a(n-13) +1784672*a(n-14) +415680*a(n-15) +176768*a(n-16) -281856*a(n-17) -92160*a(n-18) for n>22
EXAMPLE
Some solutions for 3X7
..1..1..1..1..0..1..1....0..1..0..1..0..1..0....1..1..0..1..1..1..1
..0..1..1..1..1..1..1....0..1..1..1..0..1..1....0..1..1..1..0..1..0
..1..0..1..0..1..0..0....1..1..0..0..0..0..0....0..1..0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 15 2011
STATUS
approved