OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 23*a(n-1) - 81*a(n-2) - 143*a(n-3) + 82*a(n-4) + 120*a(n-5) for n>6.
Empirical g.f.: x*(3 - 50*x + 77*x^2 + 239*x^3 + 31*x^4 - 75*x^5) / ((1 - x)*(1 + x)*(1 - 6*x)*(1 - 17*x - 20*x^2)). - Colin Barker, Oct 10 2018
EXAMPLE
Some solutions for n=5:
..0..1..2..0..4....0..1..2..1..0....0..0..1..2..5....0..1..1..2..2
..0..1..2..4..2....1..0..3..0..0....1..3..1..2..5....5..3..1..5..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 06 2013
STATUS
approved