OFFSET
1,3
COMMENTS
Row 2 of A221351.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..40
FORMULA
Empirical: a(n) = 11*a(n-1) -26*a(n-2) -10*a(n-3) +34*a(n-4) +14*a(n-5) -16*a(n-6) -8*a(n-7).
Empirical g.f.: x^2*(1 + 7*x - 24*x^2 + 14*x^3 + 14*x^4 - 14*x^5) / (1 - 11*x + 26*x^2 + 10*x^3 - 34*x^4 - 14*x^5 + 16*x^6 + 8*x^7). - Colin Barker, Feb 12 2018
EXAMPLE
Some solutions for n=3:
..0..3..1....1..3..1....1..1..0....0..1..1....0..3..1....1..1..0....0..1..1
..0..1..1....0..1..0....1..3..0....1..3..0....1..1..0....0..3..1....0..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 11 2013
STATUS
approved