Numbers k in A305056 such that k*A002110(j) is in A004490.

Terms

a(0) =1a(1) =2a(2) =4a(3) =12a(4) =24a(5) =48a(6) =144a(7) =720a(8) =1440a(9) =10080a(10) =30240a(11) =60480a(12) =302400a(13) =3326400a(14) =6652800a(15) =19958400a(16) =259459200a(17) =518918400a(18) =3632428800a(19) =61751289600