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 A238891 #5 Mar 06 2014 18:19:15
%S A238891 1,1,2,3,6,10,15,35,70,1,210,462,66,715,3003,5005,1,24310,1,92378,
%T A238891 125970,293930,646646,1352078,10626,53130,5311735,1,13123110,34597290,
%U A238891 435,44352165,1,33,2203961430,6545,1,66045,33578000610,62359143990,91390,350343565
%N A238891 Largest squarefree number in row n of Pascal's triangle.
%H A238891 T. D. Noe, <a href="/A238891/b238891.txt">Table of n, a(n) for n = 0..1000</a>
%t A238891 Table[Select[Binomial[n, Range[0, n/2]], SquareFreeQ[#] &][[-1]], {n, 0, 100}]
%Y A238891 Cf. A238337 (number of distinct squarefree numbers in row n).
%Y A238891 Cf. A238892 (index of these numbers in the row).
%K A238891 nonn
%O A238891 0,3
%A A238891 _T. D. Noe_, Mar 06 2014