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

Terms

a(0) =1a(1) =1a(2) =12a(3) =34a(4) =188a(5) =716a(6) =3312a(7) =13784a(8) =60688a(9) =259216a(10) =1125312a(11) =4842784a(12) =20938688a(13) =90305216a(14) =389997312a(15) =1683046784a(16) =7266066688a(17) =31362601216a(18) =135385869312a(19) =584397750784