OFFSET
1,1
COMMENTS
Column 2 of A223305.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 11*a(n-1) - 12*a(n-2).
Conjectures from Colin Barker, Aug 19 2018: (Start)
G.f.: 36*x*(1 - 2*x) / (1 - 11*x + 12*x^2).
a(n) = (3*2^(-n)*((11-sqrt(73))^n*(-1+sqrt(73)) + (1+sqrt(73))*(11+sqrt(73))^n)) / sqrt(73).
(End)
EXAMPLE
Some solutions for n=3:
..0..2....2..0....8..9....5..4....7..8....0..2....4..8....3..4....3..4....1..3
..2..5....4..1....4..5....9..8....4..7....1..0....2..5....4..2....1..2....0..1
..5..2....1..2....1..4....5..9....7..3....0..2....1..2....8..4....2..1....1..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 19 2013
STATUS
approved