OFFSET
1,2
COMMENTS
Column 1 of A218196.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) + a(n-5) + a(n-6) + a(n-7).
Empirical g.f.: x*(1 + x)^2*(1 + x^2)^2 / (1 - x - x^2 - x^3 - x^4 - x^5 - x^6 - x^7). - Colin Barker, Feb 19 2018
EXAMPLE
All solutions for n=3:
..1....1....1....0....0....0....1
..0....1....0....1....0....1....1
..1....0....0....1....1....0....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 23 2012
STATUS
approved