Number of primes <= n!.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =9a(5) =30a(6) =128a(7) =675a(8) =4231a(9) =30969a(10) =258689a(11) =2428956a(12) =25306287a(13) =289620751a(14) =3610490805a(15) =48686912930a(16) =706003798139