OFFSET
1,1
COMMENTS
Row 2 of A223692.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 8*a(n-1) - 11*a(n-2) - 16*a(n-3) for n>4.
Empirical g.f.: 16*x*(16 - 101*x + 104*x^2 + 175*x^3) / (1 - 8*x + 11*x^2 + 16*x^3). - Colin Barker, Aug 22 2018
EXAMPLE
Some solutions for n=3:
..2.10..2....6.14.12....6..7..0...13.11..3....4..5..6....1..9..1...11.13..5
..2..3.11....8.10..2....6..7..0....3.11.13....4..5.13....1..0..8....5..4..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 25 2013
STATUS
approved