OFFSET
1,2
FORMULA
G.f.: (1-x-x^2-6*x^3-sqrt(1-2*x-x^2-10*x^3+x^4))/x^3/6. - Vladeta Jovovic, May 07 2003
Conjecture: (n+3)*a(n) +(-2*n-3)*a(n-1) -n*a(n-2) +5*(-2*n+3)*a(n-3) +(n-3)*a(n-4)=0. - R. J. Mathar, Feb 25 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved