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 A231681 #7 Sep 20 2017 11:46:10
%S A231681 0,1,5,14,30,55,91,140,141,145,154,170,195,231,280,344,348,357,373,
%T A231681 398,434,483,547,628,637,653,678,714,763,827,908,1008,1024,1049,1085,
%U A231681 1134,1198,1279,1379,1500,1525,1561,1610,1674,1755,1855,1976,2120,2156,2205,2269,2350,2450,2571,2715,2884,2933,2997,3078,3178,3299,3443,3612,3808,3809,3813,3822,3838,3863
%N A231681 a(n) = Sum_{i=0..n} digsum_8(i)^2, where digsum_8(i) = A053829(i).
%H A231681 Jean Coquet, <a href="https://doi.org/10.1016/0022-314X(86)90067-3">Power sums of digital sums</a>, J. Number Theory 22 (1986), no. 2, 161-176.
%H A231681 P. J. Grabner, P. Kirschenhofer, H. Prodinger, R. F. Tichy, <a href="http://math.sun.ac.za/~hproding/abstract/abs_80.htm">On the moments of the sum-of-digits function</a>, <a href="http://math.sun.ac.za/~hproding/pdffiles/st_andrews.pdf">PDF</a>, Applications of Fibonacci numbers, Vol. 5 (St. Andrews, 1992), 263-271, Kluwer Acad. Publ., Dordrecht, 1993.
%H A231681 J.-L. Mauclaire, Leo Murata, <a href="https://dx.doi.org/10.3792/pjaa.59.274">On q-additive functions. I</a>, Proc. Japan Acad. Ser. A Math. Sci. 59 (1983), no. 6, 274-276.
%H A231681 J.-L. Mauclaire, Leo Murata, <a href="https://dx.doi.org/10.3792/pjaa.59.441">On q-additive functions. II</a>, Proc. Japan Acad. Ser. A Math. Sci. 59 (1983), no. 9, 441-444.
%H A231681 J. R. Trollope, <a href="http://www.jstor.org/stable/2687954">An explicit expression for binary digital sums</a>, Math. Mag. 41 1968 21-25.
%o A231681 (PARI) a(n) = sum(i=0, n, sumdigits(i, 8)^2); \\ _Michel Marcus_, Sep 20 2017
%Y A231681 Cf. A053829, A231680, A231682, A231683.
%K A231681 nonn,base
%O A231681 0,3
%A A231681 _N. J. A. Sloane_, Nov 13 2013