OFFSET
1,1
COMMENTS
Column 3 of A222281.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 92*a(n-1) - 335*a(n-2).
Conjectures from Colin Barker, Mar 14 2018: (Start)
G.f.: 5*x*(5 - 19*x) / (1 - 92*x + 335*x^2).
a(n) = ((46-sqrt(1781))^n*(-801+19*sqrt(1781)) + (46+sqrt(1781))^n*(801+19*sqrt(1781))) / (134*sqrt(1781)).
(End)
EXAMPLE
Some solutions for n=3:
..0..0..2....0..3..0....0..3..5....0..0..3....0..3..4....0..0..0....0..3..0
..4..0..3....0..1..3....0..1..2....2..3..1....2..5..5....1..2..4....3..4..0
..2..3..1....2..5..1....2..3..3....4..5..3....3..5..2....3..5..1....0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 14 2013
STATUS
approved