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 A025376 #13 Jun 15 2018 05:32:11
%S A025376 30,39,46,50,51,54,57,62,63,65,66,70,71,74,75,79,81,84,85,86,87,91,93,
%T A025376 98,106,107,109,113,116,117,118,120,121,122,125,127,131,133,137,139,
%U A025376 140,145,149,161,163,164,173,178,180,181,184,187,196,200,202,212,216,223,229,236
%N A025376 Numbers that are the sum of 4 distinct nonzero squares in exactly 1 way.
%H A025376 <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a>
%F A025376 {n: A025443(n) = 1}. - _R. J. Mathar_, Jun 15 2018
%t A025376 With[{nn=60},Take[Union[Transpose[Select[Tally[Total/@Subsets[Range[nn]^2,{4}]], #[[2]]==1&]][[1]]],nn]] (* _Harvey P. Dale_, Mar 10 2015 *)
%K A025376 nonn
%O A025376 1,1
%A A025376 _David W. Wilson_