a(n) = T(n,[ n/2 ]), where T is the array in A026300.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =9a(5) =14a(6) =44a(7) =70a(8) =230a(9) =369a(10) =1242a(11) =2002a(12) =6853a(13) =11076a(14) =38376a(15) =62127a(16) =217242a(17) =352070a(18) =1239980a(19) =2010998a(20) =7123765a(21) =11559030a(22) =41141916a(23) =66780155a(24) =238637282a(25) =387444085a(26) =1389206210a(27) =2255875650a(28) =8112107475a(29) =13174629240