OFFSET
1,2
COMMENTS
Column 2 of A304149.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +3*a(n-2) -2*a(n-3) -6*a(n-4) -4*a(n-5) for n>6.
Empirical g.f: x -x^2*(-7+16*x^2+24*x^3+12*x^4) / ( (2*x-1) *(1+x) *(2*x^3+2*x^2+x-1) ). - R. J. Mathar, May 08 2018
EXAMPLE
Some solutions for n=5
..0..1. .0..1. .0..1. .0..0. .0..1. .0..1. .0..1. .0..1. .0..0. .0..1
..1..1. .0..1. .0..1. .1..0. .1..1. .0..0. .1..1. .1..1. .1..1. .1..1
..1..1. .1..0. .0..1. .1..1. .1..1. .1..0. .0..1. .0..0. .1..0. .1..0
..0..1. .1..0. .1..0. .0..0. .0..0. .1..1. .0..0. .0..0. .0..0. .0..0
..0..0. .1..0. .0..1. .0..1. .1..0. .0..1. .1..1. .1..0. .1..1. .1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 07 2018
STATUS
approved