a(n) = a(n-1) - 36*a(n-2), a(0)=1, a(1)=6.

Terms

a(0) =1a(1) =6a(2) =-30a(3) =-246a(4) =834a(5) =9690a(6) =-20334a(7) =-369174a(8) =362850a(9) =13653114a(10) =590514a(11) =-490921590a(12) =-512180094a(13) =17160997146a(14) =35599480530a(15) =-582196416726