OFFSET
1,1
COMMENTS
Column 5 of A224577.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) - 6*a(n-2) + 3*a(n-3) + 3*a(n-4) - 6*a(n-5) + 5*a(n-6) - 4*a(n-7) + 3*a(n-8) - 3*a(n-10) + 3*a(n-11) - a(n-12) for n>16.
Empirical g.f.: x*(22096 - 81350*x + 111735*x^2 - 45121*x^3 - 67312*x^4 + 112407*x^5 - 89284*x^6 + 74683*x^7 - 53267*x^8 - 7522*x^9 + 61319*x^10 - 53808*x^11 + 14565*x^12 + 694*x^13 + 119*x^14 + 44*x^15) / ((1 - x)^3*(1 + x)*(1 - x + x^2)*(1 - x - x^6)). - Colin Barker, Sep 01 2018
EXAMPLE
Some solutions for n=2:
..1..0..0..0..0..0..0..0..0..0....1..0..0..0..0..0..0..0..0..0
..0..1..0..1..0..1..0..1..1..0....0..0..0..0..0..0..0..0..0..0
..0..1..0..1..0..1..0..1..1..0....0..0..0..0..0..0..0..0..0..0
..0..0..0..0..0..0..0..0..0..0....0..1..1..1..0..0..1..1..0..0
..0..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0..0
..0..0..0..0..0..0..0..0..0..0....0..1..1..1..0..0..1..1..0..0
..0..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 10 2013
STATUS
approved