a(1) = 1; for n > 1, a(n) = prime(A101296(n)-1) * a(floor(n/2)).

Terms

a(0) =1a(1) =2a(2) =2a(3) =6a(4) =4a(5) =10a(6) =4a(7) =42a(8) =18a(9) =20a(10) =8a(11) =110a(12) =20a(13) =20a(14) =20a(15) =546a(16) =84a(17) =198a(18) =36a(19) =220a(20) =100a(21) =40a(22) =16a(23) =1870a(24) =330a(25) =100a(26) =140a(27) =220a(28) =40a(29) =380