OFFSET
1,1
COMMENTS
Column 2 of A202461.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/4)*n^4 + (15/2)*n^3 + (229/4)*n^2 + 237*n + 427.
Conjectures from Colin Barker, May 31 2018: (Start)
G.f.: x*(729 - 2451*x + 3196*x^2 - 1895*x^3 + 427*x^4) / (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>5.
(End)
EXAMPLE
Some solutions for n=4:
..0..0..0..0....0..0..0..0....0..1..0..0....0..0..0..0....0..0..0..0
..0..1..1..1....0..0..0..0....0..1..0..0....0..0..0..0....0..0..1..0
..0..1..1..1....0..0..0..0....0..1..0..0....0..0..0..0....0..0..1..0
..1..1..1..1....0..1..0..1....0..1..1..0....0..0..0..0....0..1..1..0
..1..1..1..1....0..0..1..1....0..1..0..0....0..0..1..0....0..1..1..1
..0..1..1..1....0..0..1..1....1..1..1..1....0..0..0..1....1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2011
STATUS
approved