OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 11*a(n-1) + 44*a(n-2) - 44*a(n-3) - 11*a(n-4) + a(n-5).
Empirical g.f.: x*(81 + 133*x - 187*x^2 - 43*x^3 + 4*x^4) / ((1 - x)*(1 - 14*x + x^2)*(1 + 4*x + x^2)). - Colin Barker, Jan 05 2019
EXAMPLE
Some solutions for n=3:
..0..3..2..7....4..3..0..1....4..5..2..7....0..3..2..1....4..3..6..1
..6..1..4..5....6..9..2.11....0..1..6..3....6..7..4.11....0..5..2.11
..8..9.10.11...12..5.10..7....8.13.10.15...12..5.14..9...10.13.14..7
.12.13.14.15....8.15.14.13...12..9.14.11....8.13.10.15....8..9.12.15
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 08 2015
STATUS
approved