OFFSET
1,1
COMMENTS
Column 3 of A183811.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 6*a(n-1) + 12*a(n-2) - 83*a(n-3) + 56*a(n-4) + 60*a(n-5).
Empirical g.f.: x*(9 + x - 116*x^2 + 108*x^3 + 98*x^4) / ((1 - 2*x)*(1 - 6*x)*(1 + 2*x - 8*x^2 - 5*x^3)). - Colin Barker, Apr 04 2018
EXAMPLE
Some solutions with upper left block zero for 3 X 4:
0 0 1 1 0 0 0 1 0 0 0 0 0 0 1 1 0 0 0 1
0 0 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
0 1 1 0 1 1 0 0 1 1 1 0 0 1 0 1 1 0 1 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 07 2011
STATUS
approved