Number of decimal digits in (n!)!; A000197.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =24a(5) =199a(6) =1747a(7) =16474a(8) =168187a(9) =1859934a(10) =22228104a(11) =286078171a(12) =3949867548a(13) =58284826485a(14) =915905054360