OFFSET
4,2
FORMULA
Conjecture: -(n+10)*(n-4)*a(n) +3*(2*n+15)*(n-4)*a(n-1) +3*(-3*n^2-n+68)*a(n-2) -4*(n+4)*(n-1)*a(n-3) +12*(n-1)*(n-2)*a(n-4)=0. - R. J. Mathar, Jun 23 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved