OFFSET
1,1
COMMENTS
Column 7 of A190041.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 20*n - 60 for n>5.
Conjectures from Colin Barker, May 04 2018: (Start)
G.f.: x*(11 - 5*x - x^2 + 4*x^3 + 3*x^4 + 5*x^5 + 3*x^6) / (1 - x)^2.
a(n) = 2*a(n-1) - a(n-2) for n>7.
(End)
EXAMPLE
Some solutions for n=3:
3 1 1 6 7 2 1 1 2 0 2 1 1 2 5 3
4 6 3 7 7 3 3 3 5 7 5 6 2 7 7 4
7 7 4 7 7 5 4 4 7 7 5 6 3 7 7 4
7 7 5 7 7 7 4 7 7 7 7 7 4 7 7 7
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 04 2011
STATUS
approved