a(n) = 5*a(n-1) - 6*a(n-2) + a(n-3) with a(0)=1, a(1)=0, a(2)=-2.

Terms

a(0) =1a(1) =0a(2) =-2a(3) =-9a(4) =-33a(5) =-113a(6) =-376a(7) =-1235a(8) =-4032a(9) =-13126a(10) =-42673a(11) =-138641a(12) =-450293a(13) =-1462292a(14) =-4748343a(15) =-15418256a(16) =-50063514a(17) =-162556377a(18) =-527819057a(19) =-1713820537a(20) =-5564744720a(21) =-18068619435a(22) =-58668449392a(23) =-190495275070a(24) =-618534298433