OFFSET
1,1
COMMENTS
Column 3 of A201503.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-2) -2*a(n-6) +a(n-8).
Odd terms are A002378((n+1)/2).
Even terms are A000982((n+2)/2).
Empirical g.f.: x*(2 + 2*x + 2*x^2 + x^3 - 2*x^5 + x^7) / ((1 - x)^3*(1 + x)^3*(1 + x^2)). - Colin Barker, May 23 2018
EXAMPLE
All solutions for n=4:
..0..0..1....0..0..0....0..0..0....0..0..0....0..0..1
..0..0..1....0..0..1....0..1..1....0..0..0....0..0..1
..0..0..1....0..1..1....0..1..1....1..1..1....0..1..1
..1..1..1....1..1..1....0..1..1....1..1..1....0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 02 2011
STATUS
approved