a(n) = 2*a(n-1) + 16*a(n-2) for n>1, a(0)=1, a(1)=1.

Terms

a(0) =1a(1) =1a(2) =18a(3) =52a(4) =392a(5) =1616a(6) =9504a(7) =44864a(8) =241792a(9) =1201408a(10) =6271488a(11) =31765504a(12) =163874816a(13) =835997696a(14) =4293992448a(15) =21963948032a(16) =112631775232a(17) =576686718976