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 A268227 #11 Sep 14 2016 15:56:13 %S A268227 0,4,7,9,10,1,9,16,13,9,4,16,18,19,19,9,7,13,18,13,7,18,19,10,9,7,13, %T A268227 18,13,16,9,19,19,18,16,13,18,22,25,18,10,19,18,25,22,9,22,25,18,19,1, %U A268227 9,16,13,18,4,16,27,19,19,9,25,22,27,22,16,18,28,28,18,16,13,18,13,16,9,10,19,18 %N A268227 a(n) = sum of digits of (2n)^2. %H A268227 Harvey P. Dale, <a href="/A268227/b268227.txt">Table of n, a(n) for n = 0..1000</a> %H A268227 H. I. Okagbue, M. O. Adamu, S. A. Iyase, A. A. Opanuga, <a href="http://dx.doi.org/10.17485/ijst/2015/v8i15/69912">Sequence of Integers Generated by Summing the Digits of their Squares</a>, Indian Journal of Science and Technology, Vol 8(15), DOI: 10.17485/ijst/2015/v8i15/69912, July 2015. %t A268227 Total[IntegerDigits[#]]&/@((2*Range[0,80])^2) (* _Harvey P. Dale_, Sep 14 2016 *) %o A268227 (PARI) a(n) = sumdigits((2*n)^2); \\ _Michel Marcus_, Jul 23 2016 %Y A268227 Bisection of A004159. Cf. A268228. %K A268227 nonn,base %O A268227 0,2 %A A268227 _N. J. A. Sloane_, Jan 31 2016