Duplicate of A067919.

Terms

a(0) =2a(1) =2a(2) =3a(3) =11a(4) =14a(5) =27a(6) =28a(7) =66a(8) =212a(9) =231a(10) =552a(11) =2842a(12) =3774a(13) =6038a(14) =6784a(15) =10950a(16) =32948a(17) =78591