OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/3)*n^4 + 6*n^3 + (329/3)*n^2 + 288*n - 12 for n>6.
Conjectures from Colin Barker, Dec 16 2018: (Start)
G.f.: 4*x*(159 - 496*x + 617*x^2 - 360*x^3 + 59*x^4 + 45*x^5 - 35*x^6 + 20*x^7 - 9*x^8 + 3*x^9 - x^10) / (1 - x)^5.
a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n>11.
(End)
EXAMPLE
Some solutions for n=4:
..1..1..1..1..1..1....0..1..1..1..1..0....1..1..1..1..1..1....0..1..1..1..1..1
..1..1..1..1..1..0....1..1..1..1..1..1....1..1..1..1..1..1....1..1..1..1..1..1
..1..1..1..1..1..0....1..1..1..1..0..1....1..1..1..1..0..0....1..1..1..1..1..1
..1..1..1..1..0..0....1..1..1..1..0..1....1..1..1..1..1..1....1..1..1..1..1..1
..1..1..0..1..0..1....1..1..1..1..0..1....1..1..0..0..0..0....1..1..0..0..0..0
..1..0..0..1..0..1....1..0..0..0..0..1....1..1..0..1..1..1....1..0..1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 02 2015
STATUS
approved