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 A065739 #13 Dec 13 2024 12:38:28
%S A065739 1,4,9,25,49,81,121,196,256,361,484,625,784,961,1225,1444,1764,2025,
%T A065739 2401,2809,3249,3721,4225,4900,5476,6084,6889,7569,8464,9409,10404,
%U A065739 11236,12321,13456,14884,16129,17424,18769,20449,21904,23716,25281
%N A065739 Largest square <= sum of first n squares.
%H A065739 Harry J. Smith, <a href="/A065739/b065739.txt">Table of n, a(n) for n = 1..1000</a>
%F A065739 a(n) = A048760(A000330(n)).
%o A065739 (PARI) a(n) = { sqrtint(n*(n+1)*(2*n+1)/6)^2 } \\ _Harry J. Smith_, Oct 29 2009
%Y A065739 Cf. A048760, A000330, A065730-A065741.
%K A065739 easy,nonn
%O A065739 1,2
%A A065739 _Labos Elemer_, Nov 15 2001