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 A085037 #17 Aug 25 2014 12:22:56
%S A085037 1,9,36,100,225,441,196,36,225,3025,4356,6084,8281,11025,3600,4624,
%T A085037 2601,3249,36100,44100,53361,64009,19044,900,4225,13689,15876,164836,
%U A085037 189225,216225,15376,17424,314721,354025,44100,49284,494209,549081,152100
%N A085037 Smallest square divisible by the n-th triangular number (n(n+1)/2).
%H A085037 T. D. Noe, <a href="/A085037/b085037.txt">Table of n, a(n) for n = 1..1000</a>
%t A085037 tri = 0; Table[tri = tri + n; {p, e} = Transpose[FactorInteger[tri]]; e = Quotient[(e + 1), 2]; Times @@ (p^(2 e)), {n, 100}] (* _T. D. Noe_, Aug 01 2011 *)
%t A085037 ssq[n_]:=With[{c=n*Range[1000]},Select[c,IntegerQ[Sqrt[#]]&,1]]; Flatten[ ssq/@Accumulate[Range[40]]] (* _Harvey P. Dale_, Mar 23 2012 *)
%Y A085037 Cf. A000537, A139131 (square root of this sequence).
%K A085037 nonn
%O A085037 1,2
%A A085037 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 19 2003
%E A085037 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Jun 25 2003