OFFSET
1,1
COMMENTS
Column 2 of A235555
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) +9*a(n-2) -54*a(n-3) -15*a(n-4) +312*a(n-5) -133*a(n-6) -998*a(n-7) +840*a(n-8) +1896*a(n-9) -2268*a(n-10) -2088*a(n-11) +3472*a(n-12) +1088*a(n-13) -3120*a(n-14) +96*a(n-15) +1536*a(n-16) -384*a(n-17) -320*a(n-18) +128*a(n-19)
EXAMPLE
Some solutions for n=5
..1..0..1....0..1..0....1..1..1....1..0..1....0..1..0....1..0..0....1..0..1
..0..1..0....1..1..0....0..1..0....1..1..1....0..1..0....1..1..1....1..1..1
..1..0..1....0..1..0....1..1..0....0..1..1....1..0..0....1..0..0....0..0..0
..1..0..0....1..0..1....1..0..1....0..1..0....1..0..1....0..1..0....0..0..0
..0..1..0....0..1..0....0..1..1....1..0..1....0..0..0....0..0..1....0..0..1
..1..0..0....0..0..1....0..0..0....0..1..0....0..1..0....1..0..0....1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 12 2014
STATUS
approved