a(n) = first term in A278291 with n prime factors.

Terms

a(0) =3a(1) =10a(2) =28a(3) =136a(4) =945a(5) =5265a(6) =29889a(7) =50625a(8) =203392a(9) =3290625a(10) =6082048a(11) =32536000a(12) =326481921a(13) =3274208001a(14) =6929459200a(15) =72523096065a(16) =37694578689a(17) =471672487936