Largest power of n <= n!.

Terms

a(0) =1a(1) =2a(2) =3a(3) =16a(4) =25a(5) =216a(6) =2401a(7) =32768a(8) =59049a(9) =1000000a(10) =19487171a(11) =429981696a(12) =815730721a(13) =20661046784a(14) =576650390625