a(n) = 2*a(n-1) + 13*a(n-2), for n>1, a(0)=1, a(1)=1.

Terms

a(0) =1a(1) =1a(2) =15a(3) =43a(4) =281a(5) =1121a(6) =5895a(7) =26363a(8) =129361a(9) =601441a(10) =2884575a(11) =13587883a(12) =64675241a(13) =305992961a(14) =1452764055a(15) =6883436603a(16) =32652805921a(17) =154790287681a(18) =734067052335