OFFSET
1,1
COMMENTS
Column 7 of A207068.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (31/2520)*n^7 + (62/45)*n^6 + (4867/360)*n^5 + (2015/72)*n^4 + (1271/180)*n^3 - (4991/360)*n^2 - (713/140)*n.
Conjectures from Colin Barker, Jun 18 2018: (Start)
G.f.: 31*x*(1 + 23*x - 6*x^2 - 27*x^3 + 11*x^4) / (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:
..1..1..0..1..1..1..0....0..0..0..0..0..0..0....1..1..0..1..1..0..1
..0..1..1..0..0..0..0....1..1..1..1..1..0..0....1..1..0..0..0..0..0
..0..1..1..0..0..0..0....1..1..1..0..0..0..0....0..0..0..0..0..0..0
..0..0..0..0..0..0..0....0..1..1..0..0..0..0....0..0..0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 14 2012
STATUS
approved