OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 9*a(n-1) - 33*a(n-2) + 63*a(n-3) - 66*a(n-4) + 36*a(n-5) - 8*a(n-6) for n>11.
Empirical g.f.: 2*x*(105 + 9071*x - 65743*x^2 + 170088*x^3 - 187916*x^4 + 63288*x^5 + 30816*x^6 - 21756*x^7 - 2936*x^8 + 504*x^9 + 1360*x^10) / ((1 - x)^3*(1 - 2*x)^3). - Colin Barker, Sep 21 2018
EXAMPLE
Some solutions for n=3:
..0..1..0..0..2..0..1....0..1..0..2..3..0..1....0..1..0..2..3..2..1
..2..3..2..3..1..3..2....2..3..3..1..1..2..3....3..2..3..1..0..1..3
..1..0..2..0..2..0..1....0..1..2..0..3..0..1....0..1..0..2..3..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 28 2013
STATUS
approved