a(n) = n! / {product of factorials of the digits of n}.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =3628800a(11) =39916800a(12) =239500800a(13) =1037836800a(14) =3632428800a(15) =10897286400a(16) =29059430400a(17) =70572902400a(18) =158789030400a(19) =335221286400