a(n) = 10*a(n-1) - 15*a(n-2), a(0)=1, a(1)=5.

A084135

a(n) = 10*a(n-1) - 15*a(n-2), a(0)=1, a(1)=5.

Terms

    a(0) =1a(1) =5a(2) =35a(3) =275a(4) =2225a(5) =18125a(6) =147875a(7) =1206875a(8) =9850625a(9) =80403125a(10) =656271875a(11) =5356671875a(12) =43722640625a(13) =356876328125

External references