Even bisection of A318256.

Terms

a(0) =1a(1) =2a(2) =6a(3) =6a(4) =10a(5) =6a(6) =210a(7) =2a(8) =30a(9) =210a(10) =110a(11) =30a(12) =546a(13) =14a(14) =30a(15) =462a(16) =1190a(17) =6a(18) =51870a(19) =70a(20) =2310a(21) =2310a(22) =322a(23) =210a(24) =6630a(25) =286a(26) =330a(27) =798a(28) =290a(29) =30