Dimension of BSym_n.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =11a(5) =18a(6) =35a(7) =57a(8) =102a(9) =165a(10) =279a(11) =444a(12) =726a(13) =1136a(14) =1804a(15) =2785a(16) =4326a(17) =6584a(18) =10048a(19) =15100a(20) =22698a(21) =33723a(22) =50034a(23) =73557a(24) =107912a(25) =157122a(26) =228189a(27) =329341a(28) =473998a(29) =678576