OFFSET
1,1
COMMENTS
Row 7 of A207717
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 9*a(n-1) +204*a(n-2) -218*a(n-3) -5837*a(n-4) +7253*a(n-5) +53229*a(n-6) -91405*a(n-7) -159544*a(n-8) +385275*a(n-9) +60956*a(n-10) -516325*a(n-11) +117854*a(n-12) +297983*a(n-13) -97139*a(n-14) -89135*a(n-15) +26027*a(n-16) +14356*a(n-17) -2512*a(n-18) -1087*a(n-19) +37*a(n-20) +20*a(n-21)
EXAMPLE
Some solutions for n=4
..0..1..1..0....1..0..1..0....1..1..0..0....0..1..1..1....1..0..1..0
..1..1..0..1....1..1..0..1....0..1..0..0....1..1..0..1....0..1..0..1
..0..1..1..1....0..1..1..1....1..1..0..0....1..1..1..1....1..1..1..0
..1..0..1..1....1..1..1..1....0..1..0..0....1..0..1..0....0..1..0..1
..0..1..0..1....1..0..1..0....1..1..0..0....1..1..0..1....1..0..1..1
..1..0..1..1....0..1..0..1....1..1..0..0....1..1..1..1....1..1..1..1
..0..1..1..0....1..1..1..1....0..1..0..0....1..0..1..1....1..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 19 2012
STATUS
approved