OFFSET
1,4
COMMENTS
For an introduction to reductions of polynomials by substitutions such as x^2->x+1, see A192232.
FORMULA
Conjecture: a(n) = 2*a(n-1)+19*a(n-2)-20*a(n-3)-55*a(n-4). G.f.: x^2*(8*x^2-x+1)/((5*x^2+5*x+1)*(11*x^2-7*x+1)). [Colin Barker, Nov 22 2012]
MATHEMATICA
(See A192357.)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jun 29 2011
STATUS
approved