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 A180273 #18 Sep 24 2023 10:29:31
%S A180273 49,8464,20449,60025,2304324,3624882849
%N A180273 Squares which are a sum of consecutive squares starting with 7^2.
%C A180273 That is, terms are squares of the form sum_{i=7..m} i^2 for some m. This sequence is complete. See A180442 and A184763.
%e A180273 a(2) = 8464 = 92^2 = 7^2+8^2+9^2+...+28^2+29^2.
%t A180273 Select[Accumulate[Range[7,3000]^2],IntegerQ[Sqrt[#]]&] (* _Harvey P. Dale_, Jul 16 2014 *)
%o A180273 (PARI) for(n=8,9999999,t=n*(n+1)*(2*n+1)/6-91;if(issquare(t),print1(t,",")))
%Y A180273 Cf. A001032, A094196, A151557, A180259.
%K A180273 nonn,easy,fini,full
%O A180273 1,1
%A A180273 _Zhining Yang_, Jan 17 2011