OFFSET
1,4
COMMENTS
Column 1 of A198627.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 5*a(n-1) +a(n-2) -34*a(n-3) +20*a(n-4) +80*a(n-5) -51*a(n-6) -81*a(n-7) +31*a(n-8) +30*a(n-9) for n>10.
Empirical g.f.: x^2*(1 - 4*x - 4*x^2 + 26*x^3 + 3*x^4 - 54*x^5 - 5*x^6 + 37*x^7 + 11*x^8) / ((1 - x)*(1 + x)*(1 - 2*x)*(1 - x - x^2)*(1 - x - 3*x^2)*(1 - x - 5*x^2)). - Colin Barker, May 14 2018
EXAMPLE
All solutions for n=4:
..0....0
..0....0
..0....1
..0....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2011
STATUS
approved