OFFSET
1,1
COMMENTS
Column 2 of A204039
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) +8*a(n-2) -50*a(n-3) -9*a(n-4) +270*a(n-5) -128*a(n-6) -820*a(n-7) +709*a(n-8) +1520*a(n-9) -1824*a(n-10) -1722*a(n-11) +2797*a(n-12) +1070*a(n-13) -2696*a(n-14) -160*a(n-15) +1608*a(n-16) -240*a(n-17) -544*a(n-18) +160*a(n-19) +80*a(n-20) -32*a(n-21)
EXAMPLE
Some solutions for n=4
..1..1..0....1..1..0....1..1..1....1..0..1....0..0..1....1..0..0....1..1..1
..0..1..1....0..1..1....0..1..0....0..0..0....1..1..0....0..1..1....0..1..1
..1..1..1....1..1..1....1..1..1....0..1..1....0..1..1....1..1..0....1..1..1
..0..1..1....0..1..1....1..1..1....0..1..0....1..1..1....0..1..1....0..1..1
..1..1..1....1..1..1....1..1..1....1..1..1....1..1..1....1..1..0....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 09 2012
STATUS
approved