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 A133228 #8 Sep 15 2015 09:42:46
%S A133228 0,0,1,2,4,9,19,46,110,291,822,2455,7740,25635,88849,320749,1202674,
%T A133228 4670156,18741145,77553119,330321299,1445829174,6493985903,
%U A133228 29891948760,140843699641,678576973614,3339785593878
%N A133228 Number of primes < square root of n!.
%t A133228 Table[PrimePi[Sqrt[n! ]], {n, 27}] (* _Robert G. Wilson v_ *)
%o A133228 (PARI) a(n)=primepi(sqrtint(n!)) \\ _Charles R Greathouse IV_, Sep 15 2015
%Y A133228 Cf. A003604.
%K A133228 nonn
%O A133228 1,4
%A A133228 _Giovanni Teofilatto_, Oct 13 2007
%E A133228 More terms from _Stefan Steinerberger_ and _Robert G. Wilson v_, Oct 14 2007