Duplicate of A065891.

Terms

a(0) =1a(1) =3a(2) =9a(3) =20a(4) =45a(5) =96a(6) =201a(7) =414a(8) =851a(9) =1738a(10) =3531a(11) =7163a(12) =14483a(13) =29255a(14) =58993a(15) =118820