OFFSET
1,2
COMMENTS
Column 3 of A264655.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-2) +10*a(n-3) +4*a(n-4) -2*a(n-5) -a(n-6) +4*a(n-7) +18*a(n-8) +25*a(n-9) -8*a(n-10) -6*a(n-11) -10*a(n-12) +a(n-15)
EXAMPLE
Some solutions for n=4
..4..2..3..7....4..2..3..7....1..2..3..7....4..2..3..7....4..5..3..7
..5..6.10.11....8..0..1.11....5..0.10.11....5..0..1.11....8..0..1..2
.12.13..0..1...12.10..5..6...12..4.14..6...12.10.14..6...12.13.11..6
.16.14.15.19...16.14.15.19...16..8.15.19...16..8.15.19...16.14.15.10
.17.18..8..9...17.18.13..9...17.18.13..9...17.18.13..9...17.18.19..9
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 20 2015
STATUS
approved