a(n) = 4*a(n-1) - 10*a(n-2), with a(0)=0, a(1)=1.

Terms

a(0) =0a(1) =1a(2) =4a(3) =6a(4) =-16a(5) =-124a(6) =-336a(7) =-104a(8) =2944a(9) =12816a(10) =21824a(11) =-40864a(12) =-381696a(13) =-1118144a(14) =-655616a(15) =8558976a(16) =40792064a(17) =77578496a(18) =-97606656a(19) =-1166211584a(20) =-3688779776a(21) =-3093003264a(22) =24515784704a(23) =128993171456a(24) =270814838784a(25) =-206672359424