OFFSET
1,1
COMMENTS
Column 5 of A207024
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (13/6)*n^4 + 13*n^3 + (52/3)*n^2 - (39/2)*n.
Empirical G.f.: 13*x*(1+8*x-7*x^2+2*x^3)/(1-x)^5. [Colin Barker, May 22 2012]
EXAMPLE
Some solutions for n=4
..1..0..1..0..0....0..0..1..0..0....1..1..1..1..1....0..0..1..0..1
..0..1..0..0..1....0..0..1..0..0....1..1..1..0..1....1..1..0..1..0
..0..1..0..0..1....0..0..1..0..0....0..1..0..0..1....0..1..0..1..0
..0..1..0..0..1....0..0..1..0..0....0..1..0..0..1....0..1..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 14 2012
STATUS
approved