OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 62*a(n-1) - 961*a(n-2) for n>3.
Conjectures from Colin Barker, Jan 29 2019: (Start)
G.f.: 7*x*(1 + 58*x + x^2) / (1 - 31*x)^2.
a(n) = 840 * 31^(n-3) * (23*n-15) for n>1.
(End)
EXAMPLE
Some solutions for n=3:
..2..1. .1..5. .2..2. .2..4. .4..2. .3..5. .4..2. .3..6. .0..0. .4..3
..5..6. .4..6. .4..6. .6..1. .6..6. .3..4. .3..5. .4..2. .2..5. .5..1
..1..1. .1..6. .1..1. .6..3. .3..2. .6..3. .4..5. .1..6. .0..1. .4..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 07 2016
STATUS
approved