Duplicate of A034343.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =36a(6) =80a(7) =194a(8) =506a(9) =1449a(10) =4631a(11) =17106a(12) =74820a(13) =404283a(14) =2815595