a(2*n) = (n+1)*a(n), a(2*n+1) = (n+1)*a(n+1), with a(1) = 1.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =16a(6) =24a(7) =30a(8) =60a(9) =72a(10) =96a(11) =112a(12) =168a(13) =192a(14) =240a(15) =270a(16) =540a(17) =600a(18) =720a(19) =792a(20) =1056a(21) =1152a(22) =1344a(23) =1456a(24) =2184a(25) =2352a(26) =2688a(27) =2880a(28) =3600a(29) =3840