OFFSET
1,1
COMMENTS
Row 4 of A224038.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/24)*n^4 + (1/4)*n^3 + (83/24)*n^2 + (89/4)*n - 3 for n>2.
Conjectures from Colin Barker, Aug 26 2018: (Start)
G.f.: x*(16 - 25*x - 10*x^2 + 33*x^3 - 8*x^4 - 8*x^5 + 3*x^6) / (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>7.
(End)
EXAMPLE
Some solutions for n=3:
..1..1..1....1..1..1....0..0..1....0..1..1....0..0..1....0..0..0....1..1..1
..1..1..1....0..1..1....1..1..1....0..1..1....1..1..1....0..0..1....0..1..1
..1..1..1....0..1..1....0..1..1....0..1..1....1..1..1....1..1..1....0..0..1
..0..1..1....0..1..1....0..0..1....0..0..1....1..1..1....0..1..1....0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2013
STATUS
approved