OFFSET
1,1
COMMENTS
Column 3 of A264364.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) +7*a(n-2) +3*a(n-3) -5*a(n-4) +3*a(n-5) -a(n-6).
Empirical G.f.: -x*(-9-9*x+2*x^2+2*x^3-2*x^4+x^5) / ( (x^3 -x^2 -2*x-1) *(x^3-2*x^2+5*x-1) ). - R. J. Mathar, Dec 09 2015
EXAMPLE
Some solutions for n=4
..6..7..0..1....0..7..2..3....0..1..2..3....6..7..0..1....0..1..2..3
.10..5..2..3....4..1..6..5...10.11..4..7...10..5..2..3...10..5..6..7
..4.15..8..9....8..9.10.11....8..5..6..9....4..9..8.11....4.15..8..9
.18.19.12.11...18.19.12.13...18.19.12.13...18.19.14.15...18.13.12.11
.16.13.14.17...16.17.14.15...16.17.14.15...12.13.16.17...16.17.14.19
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 12 2015
STATUS
approved