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 A278114 #14 Sep 08 2022 08:46:17
%S A278114 1,4,7,11,15,20,25,31,37,46,53,61,68,77,87,97,106,118,128,139,152,163,
%T A278114 177,190,204,217,231,247,263,278,293,309,326,344,363,377,399,418,436,
%U A278114 452,474,492,516,536,558,580,600,623,647,669,692,713,738,765,789,816,842,867
%N A278114 Number of primes <= 2n^2.
%C A278114 This is the row length sequence for both A278113 and A278115.
%H A278114 Jason Kimberley, <a href="/A278114/b278114.txt">Table of n, a(n) for n = 1..5000</a>
%F A278114 a(n) = A000720(A001105(n)).
%t A278114 Table[PrimePi[2 n^2], {n, 58}] (* _Michael De Vlieger_, Feb 17 2017 *)
%o A278114 (Magma)
%o A278114 A278114:=func<n|#PrimesUpTo(2*n^2)>;
%o A278114 [A278114(n):n in[1..58]];
%o A278114 (PARI) a(n) = primepi(2*n^2); \\ _Michel Marcus_, Feb 15 2017
%Y A278114 Cf. A038107, A278100.
%K A278114 nonn,easy
%O A278114 1,2
%A A278114 _Jason Kimberley_, Feb 09 2017