OFFSET
1,1
COMMENTS
Column 3 of A223440
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 15*a(n-1) -18*a(n-2) -310*a(n-3) +167*a(n-4) +475*a(n-5) -244*a(n-6) -100*a(n-7) +48*a(n-8)
EXAMPLE
Some solutions for n=3
.13.11.13....9.11..9...12..4..5....9.15.13....6..5.13....5..6.14....6..5..6
.15..9.11....1..9..1....4..3..4...15..9.11....7..6..5....6.14.12....5..6..7
.13.11.13....0..1..2....5..4.12....9.15.13....0..7..6...14.12.14....6.14..6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 20 2013
STATUS
approved