OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 14*a(n-1) - 85*a(n-2) + 294*a(n-3) - 639*a(n-4) + 906*a(n-5) - 839*a(n-6) + 490*a(n-7) - 164*a(n-8) + 24*a(n-9).
Empirical g.f.: x*(13111 - 136493*x + 592090*x^2 - 1408240*x^3 + 2032769*x^4 - 1861139*x^5 + 1077330*x^6 - 359076*x^7 + 52488*x^8) / ((1 - x)^5*(1 - 2*x)^3*(1 - 3*x)). - Colin Barker, Nov 23 2018
EXAMPLE
Some solutions for n=3:
1 1 0 0 1 1 0 0 1 0 0 0 1 1 0 0 1 1 1 1
1 1 0 0 1 1 0 0 1 1 1 1 2 2 1 1 2 2 2 2
2 2 1 1 1 1 0 0 1 1 1 1 1 1 0 0 0 0 0 0
2 2 2 2 2 2 1 1 1 1 1 2 1 1 0 0 0 0 0 0
0 0 0 0 2 2 2 2 0 0 0 1 1 1 1 1 0 1 1 1
0 0 0 0 1 1 1 1 0 0 0 2 0 0 0 0 0 1 1 1
0 1 2 2 0 0 0 0 0 0 0 2 0 0 2 2 0 1 2 2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 28 2014
STATUS
approved