OFFSET
1,1
COMMENTS
Column 5 of A202461.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/840)*n^7 + (3/40)*n^6 + (47/30)*n^5 + 16*n^4 + (10847/120)*n^3 + (11557/40)*n^2 + (258737/420)*n + 715.
Conjectures from Colin Barker, May 31 2018: (Start)
G.f.: x*(1728 - 9687*x + 24626*x^2 - 36022*x^3 + 32318*x^4 - 17650*x^5 + 5408*x^6 - 715*x^7) / (1 - x)^8.
a(n) = 8*a(n-1) - 28*a(n-2) + 56*a(n-3) - 70*a(n-4) + 56*a(n-5) - 28*a(n-6) + 8*a(n-7) - a(n-8) for n>8.
(End)
EXAMPLE
Some solutions for n=4:
..0..0..0..0..1..1..0....0..0..0..0..0..1..0....0..0..0..0..0..0..0
..0..0..0..0..1..1..1....0..0..0..0..1..1..0....0..0..0..0..0..0..0
..0..0..0..1..1..1..1....0..0..0..0..1..1..1....0..0..0..0..0..0..0
..0..0..0..1..1..1..1....1..1..1..1..1..1..1....0..0..0..0..1..1..0
..0..0..1..1..1..1..1....1..1..1..1..1..1..1....0..0..1..1..1..1..1
..0..0..0..1..1..1..1....0..0..1..1..1..1..1....0..1..1..1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2011
STATUS
approved