OFFSET
1,1
COMMENTS
Column 1 of A205431.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + 73*a(n-2) + 39*a(n-3) - 384*a(n-4) - 432*a(n-5) for n>6.
Empirical g.f.: x*(15 + 87*x - 327*x^2 - 1335*x^3 - 952*x^4 + 144*x^5) / ((1 - 9*x)*(1 - x - 4*x^2)*(1 + 9*x + 12*x^2)). - Colin Barker, Mar 03 2018
EXAMPLE
Some solutions for n=4:
0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 1
0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1
0 1 2 1 0 1 0 0 1 1 0 1 0 1 0 1 2 1 0 0
0 1 0 2 1 0 1 1 1 1 2 1 2 3 1 0 1 2 0 0
1 2 3 1 1 0 2 1 2 1 1 0 3 0 2 0 0 3 1 1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 27 2012
STATUS
approved