OFFSET
1,1
COMMENTS
Row 7 of A256816.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/120)*n^5 + (1/4)*n^4 + (193/8)*n^3 - (169/4)*n^2 + (8323/15)*n - 1216 for n>5.
Empirical g.f.: x*(256 - 1024*x + 1792*x^2 - 1536*x^3 + 400*x^4 + 208*x^5 - 35*x^6 - 102*x^7 + 78*x^8 - 64*x^9 + 28*x^10) / (1 - x)^6. - Colin Barker, Jan 21 2018
EXAMPLE
Some solutions for n=4:
..0....1....1....1....1....0....1....1....1....1....1....1....0....0....1....1
..1....0....1....1....1....1....0....1....0....1....1....0....0....1....1....1
..1....0....1....0....1....1....1....0....1....0....1....1....0....0....1....1
..1....1....0....0....1....1....1....1....1....1....0....1....0....0....0....0
..0....1....1....0....1....0....1....0....1....0....1....1....1....1....1....1
..1....1....1....0....0....1....0....1....1....1....1....1....1....1....0....0
..1....1....1....0....1....0....0....1....1....0....1....0....0....1....0....0
..0....1....0....0....0....1....0....1....0....0....1....1....1....1....0....0
..1....1....0....0....1....1....0....0....0....1....0....0....1....1....1....1
..1....0....1....1....0....1....1....0....0....0....0....0....0....0....0....0
..1....0....0....0....0....0....1....0....0....1....1....1....1....0....1....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 10 2015
STATUS
approved