a(n) = T(n,[ n/2 ]), where T is the array in A026323.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =10a(5) =15a(6) =50a(7) =77a(8) =266a(9) =414a(10) =1452a(11) =2277a(12) =8073a(13) =12726a(14) =45460a(15) =71940a(16) =258434a(17) =410193a(18) =1479986a(19) =2354651a(20) =8525205a(21) =13589730a(22) =49342636a(23) =78780957a(24) =286721450a(25) =458396900a(26) =1671668520a(27) =2675641815a(28) =9774222930a(29) =15659853579