a(n) = T(10,n), array T given by A047858.

Terms

a(0) =1a(1) =12a(2) =35a(3) =83a(4) =183a(5) =391a(6) =823a(7) =1719a(8) =3575a(9) =7415a(10) =15351a(11) =31735a(12) =65527a(13) =135159a(14) =278519a(15) =573431a(16) =1179639a(17) =2424823a(18) =4980727a(19) =10223607a(20) =20971511a(21) =42991607a(22) =88080375a(23) =180355063a(24) =369098743a(25) =754974711a(26) =1543503863a(27) =3154116599a(28) =6442450935a(29) =13153337335