OFFSET
1,1
COMMENTS
Column 5 of A221024.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..39
FORMULA
Empirical: a(n) = 36*a(n-1) - 128*a(n-2) for n>5.
Empirical g.f.: x*(16 + 150*x + 6079*x^2 + 45124*x^3 - 1152*x^4) / ((1 - 4*x)*(1 - 32*x)). - Colin Barker, Aug 03 2018
EXAMPLE
Some solutions for n=3:
..1..0..0..0..1....1..0..0..1..0....0..1..1..0..1....1..0..1..0..0
..0..1..1..0..0....1..0..0..0..1....1..0..1..1..0....0..0..1..0..1
..0..1..0..1..0....1..1..1..1..0....0..1..1..0..0....1..0..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 28 2012
STATUS
approved