OFFSET
1,3
COMMENTS
Column 5 of A194485.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..46
FORMULA
Empirical: a(n) = (1/3840)*n^10 + (1/768)*n^9 - (1/384)*n^8 - (59/1920)*n^7 + (281/3840)*n^6 + (149/3840)*n^5 - (5/24)*n^4 + (29/320)*n^3 + (11/80)*n^2 - (1/10)*n.
Empirical g.f.: 3*x^3*(2 + 56*x + 191*x^2 + 85*x^3 - 31*x^4 + 11*x^5 + x^6) / (1 - x)^11. - Colin Barker, May 05 2018
EXAMPLE
Some solutions for 4 X 4 X 4:
.....1........1........0........1........0........0........0........0
....1.1......1.0......1.1......0.0......0.1......1.1......1.0......1.1
...0.1.1....0.1.0....0.1.0....1.0.1....0.1.0....1.0.1....1.0.0....1.0.0
..0.0.0.0..0.1.0.1..0.1.1.0..1.1.0.0..0.1.1.1..0.1.0.0..1.1.0.1..1.1.0.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 26 2011
STATUS
approved