Duplicate of A072265.

Terms

a(0) =2a(1) =1a(2) =9a(3) =13a(4) =49a(5) =101a(6) =297a(7) =701a(8) =1889a(9) =4693a(10) =12249a(11) =31021a(12) =80017a(13) =204101a(14) =524169