This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A076960 #19 Jun 11 2024 04:36:22
%S A076960 0,8,125,4222,258659,25306159,3610490130,706003793908,181035032176791,
%T A076960 58893601709293849,23688535118130027712,11539922212278290441881
%N A076960 a(n) is the number of primes between n! and (2n)!.
%F A076960 a(n) = A003604(2*n) - A003604(n), for n >= 2. - _Amiram Eldar_, Jun 11 2024
%e A076960 a(2) = 8 as pi(24) = 9 and pi(2) = 1.
%p A076960 with(numtheory): 0,seq(pi((2*n)!)-pi(n!),n=2..5); # _Emeric Deutsch_, Jul 31 2005
%t A076960 a[n_] := PrimePi[(2n)! - 1] - PrimePi[n! ]; Table[a[n], {n, 1, 8}] (* _Ryan Propper_, Sep 11 2005 *)
%Y A076960 Cf. A003604, A076959.
%K A076960 nonn,more
%O A076960 1,2
%A A076960 _Amarnath Murthy_, Oct 21 2002
%E A076960 Corrected and extended by _Emeric Deutsch_, Jul 31 2005
%E A076960 a(7)-a(8) from _Ryan Propper_, Sep 11 2005
%E A076960 a(9) from _Donovan Johnson_, Mar 10 2010
%E A076960 a(10)-a(12) from _Amiram Eldar_, Jun 11 2024