Duplicate of A038606.

Terms

a(0) =0a(1) =1a(2) =5a(3) =12a(4) =31a(5) =69a(6) =181a(7) =443a(8) =1052a(9) =2701a(10) =6455a(11) =15928a(12) =40073a(13) =100362a(14) =251707a(15) =637235