Duplicate of A099094.

Terms

a(0) =1a(1) =0a(2) =3a(3) =3a(4) =9a(5) =18a(6) =36a(7) =81a(8) =162a(9) =351a(10) =729a(11) =1539a(12) =3240a(13) =6804a(14) =14337a(15) =30132a(16) =63423a(17) =133407